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Stock-Based Compensation (Details) (USD $)
In Millions, except Share data, unless otherwise specified
3 Months Ended 9 Months Ended 1 Months Ended 1 Months Ended 1 Months Ended 9 Months Ended 1 Months Ended 9 Months Ended 1 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Jul. 31, 2013
RSUs
May 31, 2013
RSUs
May 30, 2013
RSUs
Feb. 28, 2013
Omnibus Plan [Member]
RSUs
Sep. 30, 2012
Omnibus Plan [Member]
RSUs
Feb. 28, 2013
Omnibus Plan [Member]
Performance Stock Units [Member]
Feb. 28, 2013
Omnibus Plan [Member]
Performance Stock Units Subject To Performance Condition, Condition One [Member]
Mar. 31, 2012
Omnibus Plan [Member]
Performance Stock Units Subject To Performance Condition, Condition One [Member]
Minimum
Mar. 31, 2012
Omnibus Plan [Member]
Performance Stock Units Subject To Performance Condition, Condition One [Member]
Maximum
Feb. 28, 2013
Omnibus Plan [Member]
Performance Stock Units Subject To Performance Condition, Condition Two [Member]
Sep. 30, 2013
Omnibus Plan [Member]
Performance Stock Units Subject To Performance Condition, Condition Two [Member]
Minimum
Sep. 30, 2013
Omnibus Plan [Member]
Performance Stock Units Subject To Performance Condition, Condition Two [Member]
Maximum
Feb. 28, 2013
Omnibus Plan [Member]
Performance Stock Units Subject To Performance Condition, Condition Three [Member]
May 31, 2013
Three Year Vesting Period [Member]
RSUs
Sep. 30, 2013
Three Year Vesting Period [Member]
RSUs
May 31, 2013
Two Year Vesting Period [Member]
RSUs
Sep. 30, 2013
Two Year Vesting Period [Member]
RSUs
Stock-Based Compensation                                          
Awards granted (in shares)         5,543 166,576   5,247   1,707,458 1,136,724     487,167     83,567 162,584   3,992  
Award vesting periods                                     3 years   2 years
Accelerated Compensation Cost $ 1.6                                        
Weighted average grant date fair value         $ 25.61   $ 23.80   $ 19.95                        
Variation in number of units that will ultimately be granted as percentage of the original grant (as a percent)                       0.00% 150.00%   0.00% 100.00%          
Compensation Expense 12.8 7.3 32.5 22.3                                  
Income Tax Benefit (4.9) (2.8) (12.6) (8.6)                                  
Total 7.9 4.5 19.9 13.7                                  
Unrecognized compensation cost related to non-vested stock options, RSUs and PSUs granted $ 46.5   $ 46.5                                    
Period for recognition of total unrecognized compensation cost (in years)     1 year 6 months 1 day