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Share-Based Compensation (Narrative) (Details) - USD ($)
$ / shares in Units, $ in Millions
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Tax deductions for all share-based compensation $ 22.4 $ 6.5  
Excess tax benefit on share-based compensation $ (0.7) (5.0) $ (1.7)
2005 Plan      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Authorized shares to be granted 9,000,000    
Shares reserved for future grants (in shares) 1,900,000    
Stock Option      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Cash received from stock option exercises $ 10.0 1.2 0.2
Tax deductions for all share-based compensation $ 0.5 $ 0.1 $ 0.1
Granted (in shares) 177,400 0 352,100.0
Granted (in dollars per share) $ 16.79   $ 19.65
Intrinsic value, options exercised $ 1.9 $ 0.1 $ 0.1
Fair value of shares vested 0.7 1.0 27.7
Compensation cost related to nonvested options not yet recognized $ 1.6 $ 1.3 $ 1.5
Weighted average recognition period 1 year 9 months 12 days 1 year 7 months 12 days 2 years 3 months 18 days
Stock Option | 2005 Plan      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Expiration period 10 years    
Vesting period 3 years    
Restricted Stock and Restricted Stock Units (RSUs)      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Fair value of shares vested $ 15.2 $ 14.2 $ 8.7
Compensation cost related to nonvested options not yet recognized $ 7.8    
Weighted average recognition period 1 year 9 months 6 days    
Nonvested stock and restricted stock units (in shares) 900,000    
Weighted average grant price, per share expected to vested in next year $ 10.47    
Fair value of shares expected to vested in next year $ 9.9    
Restricted Stock and Restricted Stock Units (RSUs) | Minimum      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Vesting period 3 years