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Stock-Based Compensation (Details) (USD $)
In Millions, except Share data, unless otherwise specified
3 Months Ended
Mar. 31, 2013
Years
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Shares available for grant 2,056,369
Shares of common stock reserved for issuance 3,716,733
Total compensation cost not yet recognized $ 39.3
Total compensation cost not yet recognized - period for recognition 2.0
Stock Incentive Plan [Member]
 
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Number of shares authorized 10,750,000
Supplemental Stock Incentive Plan [Member]
 
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Number of shares authorized 500,000
Stock Options [Member]
 
Options Outstanding and Exercisable:  
Options outstanding, number 800,790
Options exercisable, number 196,163
Options outstanding, weighted average exercise price $ 37.93
Options exercisable, weighted average exercise price $ 26.31
Options outstanding, aggregate intrinsic value 21.3
Options exercisable, aggregate intrinsic value 7.5
Options outstanding, weighted average remaining contractual term (in years) 5.1
Options exercisable, weighted average remaining contractual term (in years) 3.6
Restricted Stock Units [Member]
 
Restricted Stock Units Nonvested and Expected to Vest  
Restricted stock units nonvested, number 859,576
Restricted stock units expected to vest, number 748,735
Restricted stock units nonvested, weighted average grant date per share fair value $ 42.43
Restricted stock units expected to vest, weighted average grant date per share fair value $ 41.97
Restricted stock units nonvested, aggregate intrinsic value 55.5
Restricted stock units expected to vest, aggregate intrinsic value $ 48.3
Restricted stock units nonvested, weighted average remaining term to vest (in years) 1.6
Restricted stock units expected to vest, weighted average remaining term to vest (in years) 1.6