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Share-Based Compensation (Details) (USD $)
In Millions, except Share data, unless otherwise specified
3 Months Ended
Mar. 31, 2012
Mar. 31, 2011
Share-Based Compensation [Abstract]    
Shares available for future grants 13,200,000  
Total compensation expense related to share-based compensation $ 5.7 $ 7.4
Stock Options [Member]
   
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]    
Fair value of options at grant date $ 14.49  
Risk-free interest rate 81.00%  
Expected price volatility 55.90%  
Expected dividend yield 0.26%  
Expected life in years 5.0  
Options Outstanding [RollForward]    
Outstanding at December 31, 2011 (in shares) 2,003,694  
Granted (in shares) 283,029  
Exercised (in shares) (313,342)  
Forfeited (in shares) 0  
Outstanding at March 31, 2012 (in shares) 1,973,381  
Options Excercisable (in shares) 1,393,956  
Unvested Options (in shares) 579,425  
Weighted-Average Price [Abstract]    
Weighted-Average Price, beginning (in dollars per share) $ 21.23  
Weighted-Average Price, Granted (in dollars per share) $ 30.90  
Weighted-Average Price, Exercised (in dollars per share) $ 8.15  
Weighted-Average Price, Forfeited (in dollars per share) $ 0  
Weighted-Average Price, Ending (in dollars per share) $ 24.69  
Weighted-Average Price, Options Excercisable $ 22.08  
Weighted-Average Price, Unvested Options $ 30.97  
Weighted-Average Remaining Contractual Term, Outstanding (in years) 3.8  
Aggregate Intrinsic Value, Outstanding 13.3  
Weighted-Average Remaining Contractual Term, Options Excercisable (in years) 3.0  
Aggregate Intrinsic Value, Options Excercisable 12.4  
Weighted-Average Remaining Contractual Term, Unvested Options (in years) 6.0  
Aggregate Intrinsic Value, Unvested Options 0.9  
Intrinsic value of options exercised 6.9 1.8
Unrecognized compensation cost 5.4  
Weighted-average period for recognition of compensation costs (in years) 2.6  
Restricted Stock [Member]
   
Weighted-Average Price [Abstract]    
Weighted-Average Price, beginning balance (in dollars per share) $ 32.80  
Weighted-Average Price, Granted (in dollars per share) $ 30.89 $ 39.00
Weighted-Average Price, Vested (in dollars per share) $ 32.85  
Weighted-Average Price, Forfeited (in dollars per share) $ 32.89  
Weighted-Average Price, Ending Balance (in dollars per share) $ 31.87  
Unrecognized compensation cost 30.0  
Weighted-average period for recognition of compensation costs (in years) 2.6  
Vesting period minimum (in years) 3Y  
Vesting period maximum (in years) 4Y  
Total fair value of stock that vested 11.6 7.9
Restricted Shares Outstanding [Roll Forward]    
Balance, beginning (in shares) 1,099,752  
Granted (in shares) 659,633  
Vested (in shares) (362,743)  
Forfeited (in shares) (31,036)  
Balance, Ending (in shares) 1,365,606  
Performance Share Units [Member]
   
Weighted-Average Price [Abstract]    
Weighted-Average Price, beginning balance (in dollars per share) $ 39.07  
Weighted-Average Price, Granted (in dollars per share) $ 30.90 $ 39.07
Weighted-Average Price, Vested (in dollars per share) $ 0  
Weighted-Average Price, Forfeited (in dollars per share) $ 39.07  
Weighted-Average Price, Ending Balance (in dollars per share) $ 34.17  
Unrecognized compensation cost $ 4.4  
Weighted-average period for recognition of compensation costs (in years) 2.6  
Restricted Shares Outstanding [Roll Forward]    
Balance, beginning (in shares) 115,274  
Granted (in shares) 168,448  
Vested (in shares) 0  
Forfeited (in shares) (2,707)  
Balance, Ending (in shares) 281,015