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Share-Based Compensation (Narrative) (Details) - USD ($)
$ / shares in Units, $ in Millions
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Tax deductions for all share-based compensation $ 6.5 $ 4.3  
Excess tax benefit on share-based compensation $ (5.0) (1.7) $ (0.5)
2005 Plan [Member]      
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) 3,200,000    
Stock Option [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Cash received from stock option exercises $ 1.2 0.2 0.3
Tax deductions for all share-based compensation $ 0.1 $ 0.1 $ 0.1
Granted (in shares) 0 352,100.0 0
Weighted average fair value of options granted (in dollars per share) $ 5.68 $ 19.65  
Intrinsic value, options exercised $ 0.1   $ 0.2
Fair value of shares vested 1.0 $ 27.7 25.7
Compensation cost related to nonvested options not yet recognized $ 1.3 $ 1.5 $ 1.1
Weighted average recognition period 1 year 7 months 12 days 2 years 3 months 18 days 1 year 2 months 12 days
Stock Option [Member] | 2005 Plan [Member]      
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) [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Fair value of shares vested $ 14.2 $ 8.7 $ 8.1
Compensation cost related to nonvested options not yet recognized $ 6.1    
Weighted average recognition period 1 year 7 months 6 days    
Nonvested stock and restricted stock units (in shares) 1,000,000    
Weighted average grant price, per share expected to vested in next year $ 17.30    
Fair value of shares expected to vested in next year $ 17.3    
Restricted Stock and Restricted Stock Units (RSUs) [Member] | Minimum [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Vesting period 3 years    
Restricted Stock and Restricted Stock Units (RSUs) [Member] | Maximum [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Vesting period 5 years