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Employee Benefit Plans (Restricted Stock Units) (Details) - USD ($)
$ / shares in Units, $ in Millions
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
RSUs and performance-based equity awards      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Additional Disclosures [Abstract]      
Aggregate intrinsic value of vested awards $ 14.0 $ 16.9 $ 14.4
Vesting period 4 years    
Rsus Other Than Performance Based Rsus      
Activity:      
Outstanding, beginning of year 819,309    
Granted, shares 689,042    
Forfeited, shares (123,307)    
Fully vested, shares (251,115)    
Outstanding, end of year 1,133,929 819,309  
Weighted average grant date fair value:      
Outstanding, beginning of year - weighted average grant date fair value $ 37.33    
Granted - weighted average grant date fair value 32.00    
Forfeited - weighted average grant date fair value (34.80)    
Vested - weighted average grant date fair value (36.30)    
Outstanding, end of year - weighted average grant date fair value $ 34.56 $ 37.33  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Additional Disclosures [Abstract]      
Aggregate intrinsic value $ 60.9    
Total compensation cost not yet recognized $ 28.9    
Compensation cost not yet recognized, period for recognition 1 year 8 months 12 days    
Performance Based Rsus      
Activity:      
Outstanding, beginning of year 591,683    
Granted, shares 200,730    
Additional awards granted due to achievement of performance criteria, shares 24,979    
Forfeited, shares (16,993)    
Fully vested, shares (216,958)    
Outstanding, end of year 583,441 591,683  
Weighted average grant date fair value:      
Outstanding, beginning of year - weighted average grant date fair value $ 34.78    
Granted - weighted average grant date fair value 31.95    
Additional awards granted due to achievement of performance criteria - weighted average grant date fair value 29.24    
Forfeited - weighted average grant date fair value (36.71)    
Vested - weighted average grant date fair value (29.24)    
Outstanding, end of year - weighted average grant date fair value $ 35.57 $ 34.78  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Additional Disclosures [Abstract]      
Aggregate intrinsic value $ 31.3    
Total compensation cost not yet recognized $ 7.3    
Compensation cost not yet recognized, period for recognition 1 year 7 months 2 days    
The rate at which performance awards are expensed 100.00% 100.00% 55.00%