Annual report pursuant to Section 13 and 15(d)

Share-Based Compensation Share-based Plan Descriptions and Information (Details)

v2.4.0.6
Share-Based Compensation Share-based Plan Descriptions and Information (Details)
In Millions, unless otherwise specified
12 Months Ended 0 Months Ended 12 Months Ended
Dec. 31, 2012
1997 Stock Option Plan [Member]
Common Stock
Jun. 30, 2009
Common Stock
2003 Plan [Member]
Phantom Share Units (PSUs) [Member]
Jun. 30, 2009
Common Stock
2003 Plan [Member]
Jun. 01, 2009
Common Stock
2003 Plan [Member]
Dec. 31, 2012
Three-year graded vesting period [Member]
Restricted Stock [Member]
Feb. 25, 2009
Three-year graded vesting period [Member]
2003 Plan [Member]
Phantom Share Units (PSUs) [Member]
Dec. 31, 2012
One Year Graded Vesting Period [Member]
Restricted Stock [Member]
Dec. 31, 2012
Four-year graded vesting period [Member]
Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period         3 years 3 years 1 year 4 years
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized 5.0 21.0 21.0 11.0