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Share-Based Compensation Phantom Stock (Details) (USD $)
In Millions, except Share data, unless otherwise specified |
12 Months Ended | 0 Months Ended | 12 Months Ended | 0 Months Ended | 12 Months Ended | 1 Months Ended | 3 Months Ended | 1 Months Ended | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
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Dec. 31, 2011
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Dec. 31, 2010
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Dec. 31, 2009
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Dec. 31, 2011
Phantom Stock [Member]
Three-year graded vesting period [Member]
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Feb. 25, 2009
Phantom Stock [Member]
2003 Plan [Member]
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Dec. 31, 2011
Phantom Stock [Member]
2003 Plan [Member]
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Dec. 31, 2010
Phantom Stock [Member]
2003 Plan [Member]
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Dec. 31, 2009
Phantom Stock [Member]
2003 Plan [Member]
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Jun. 12, 2009
Phantom Stock [Member]
2003 Plan [Member]
Chief Executive Officer [Member]
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Dec. 31, 2011
Phantom Stock [Member]
Time based plan and Performance-based plan [Member]
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Dec. 31, 2011
Phantom Stock [Member]
Time based plan [Member]
|
Dec. 31, 2011
Phantom Stock [Member]
Performance-based plan [Member]
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May 31, 2007
Phantom Stock [Member]
2007 Bonus Plan [Member]
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May 31, 2007
Phantom Stock [Member]
2008-2010 Bonus Plan [Member]
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Dec. 31, 2008
Phantom Stock [Member]
2008-2010 Bonus Plan [Member]
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Jun. 30, 2009
Phantom Stock [Member]
Common Stock [Member]
2003 Plan [Member]
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Jun. 01, 2009
Phantom Stock [Member]
Common Stock [Member]
2003 Plan [Member]
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Jan. 31, 2008
Phantom Stock [Member]
Common Stock [Member]
2007 Bonus Plan [Member]
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Jun. 12, 2009
Maximum [Member]
Phantom Stock [Member]
2003 Plan [Member]
|
Feb. 25, 2009
Maximum [Member]
Phantom Stock [Member]
2003 Plan [Member]
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | ||||||||||||||||||||
| Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period | 5,545,000 | 800,000 | 537,000 | 1,794,000 | ||||||||||||||||
| Share-based Compensation Arrangement by Share-based Payment Award, Shares Issued in Period | 5,262,000 | 502,000 | 522,000 | 537,000 | ||||||||||||||||
| Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant | 3,000,000 | 1,000,000 | ||||||||||||||||||
| Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number | 1,565,000 | 4,780,000 | ||||||||||||||||||
| Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized | 21,000,000 | 11,000,000 | ||||||||||||||||||
| Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period | 3 years | |||||||||||||||||||
| Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost | $ 26.4 | $ 17.9 | $ 19.2 | $ 12.2 | $ 5.1 | |||||||||||||||
| Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period | 1,041,000 | |||||||||||||||||||