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Share-Based Compensation (Narrative) (Details) - USD ($)
$ / shares in Units, $ in Millions
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Granted 352,100 0 334,000
Cash received from stock option exercises $ 0.2 $ 0.3 $ 0.7
Tax deductions for all share-based compensation 4.3 7.0  
Excess tax benefit on share-based compensation $ (1.7) (0.5) [1] $ (0.7)
Weighted average fair value of options granted $ 5.68   $ 18.60
Stock Option [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Tax deductions for all share-based compensation $ 0.1 0.1 $ 0.4
Weighted average fair value of options granted $ 19.65   $ 35.24
Intrinsic value of options exercised $ 0.1 0.2 $ 1.0
Fair value of shares vested 27.7 25.7 20.8
Compensation cost related to nonvested options not yet recognized $ 1.5 $ 1.1 $ 4.1
Weighted average recognition period 2 years 3 months 18 days 1 year 2 months 12 days 1 year 10 months 24 days
Nonvested Stock [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Vesting period 5 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 $ 8.7 $ 8.1 $ 6.2
Compensation cost related to nonvested options not yet recognized $ 9.3    
Weighted average recognition period 1 year 10 months    
Nonvested stock and restricted stock units 538,000    
Weighted average grant price, per share expected to vested in next year $ 26.52    
Fair value of shares expected to vested in next year $ 14.3    
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 3,600,000    
2005 Plan [Member] | Stock Option [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Vesting period 3 years    
Expiration period 10 years    
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