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Stock-Based Compensation (Details 3) (USD $)
In Millions, except Share data, unless otherwise specified
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Stock-based compensation costs      
Compensation costs related to stock-based compensation, pre-tax $ 22.8 $ 28.6 $ 24.7
Compensation costs related to stock-based compensation, after-tax 13.8 19.9 17.8
Total compensation cost related to nonvested awards not yet recognized 20.0 35.0  
Maximum
     
Stock-based compensation costs      
Vesting period 5 years    
Restricted stock
     
Stock-based compensation      
Outstanding at the beginning of the period (in shares) 210,527    
Awarded (in shares) 257,500    
Released (in shares) (85,782)    
Exchanged (in shares) (60,000)    
Canceled (in shares) (30,434)    
Outstanding at the end of the period (in shares) 291,811    
Stock-based compensation costs      
Total compensation cost related to nonvested awards not yet recognized 6.8 1.7  
Stock options
     
Stock-based compensation costs      
Total compensation cost related to nonvested awards not yet recognized 13.2 33.3  
Phantom stock unit awards
     
Stock-based compensation costs      
Compensation costs related to stock-based compensation, pre-tax 11.9 5.9 2.1
Total compensation cost related to nonvested awards not yet recognized 16.5    
Period for recognition of unrecognized compensation cost 2 years 8 months 19 days    
Amounts paid on cash settled awards 6.6 2.6 1.8
Phantom stock unit awards | Minimum
     
Stock-based compensation costs      
Vesting period 4 years    
Phantom stock unit awards | Maximum
     
Stock-based compensation costs      
Vesting period 5 years    
Stock appreciation rights
     
Stock-based compensation costs      
Compensation costs related to stock-based compensation, pre-tax 7.5 4.4 1.4
Total compensation cost related to nonvested awards not yet recognized 8.9    
Period for recognition of unrecognized compensation cost 1 year 10 months 2 days    
Vesting period 4 years    
Amounts paid on cash settled awards $ 1.7 $ 0.2 $ 0