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Shareholders' Equity (Stock Options) (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Millions
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Share-based Compensation Arrangement by Share-based Payment Award, Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]      
Unrecognized compensation cost $ 17.4    
Weighted average period costs expected to be recognized (in years) 3 years 4 months 6 days    
Stock Options and Stock Appreciation Rights (SARs) [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Grant date fair value of SARs (in dollars per share) $ 11.37 $ 13.40 $ 9.77
Expected stock price volatility (percent) 25.96% 34.85% 35.88%
Risk-free interest rate (percent) 1.49% 1.53% 1.04%
Expected annual dividend yield (percent) 1.55% 1.80% 1.79%
Expected term of option & SARs (in years) 5 years 8 months 12 days 6 years 4 months 24 days 6 years 3 months 18 days
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]      
Number of shares, Outstanding at December 31, 2014 453    
Number of shares, Granted 609    
Number of shares, Forfeited (19)    
Number of shares, Exercised (123)    
Number of shares, Outstanding at December 31, 2015 920 453  
Number of shares, Exercisable 219    
Number of shares, SARs expected to vest 701    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Roll Forward]      
Weighted average exercise price, Outstanding at December 31, 2014 (in dollars per share) $ 28.85    
Weighted average exercise price, Granted (in dollars per share) 51.48    
Weighted average exercise price, Forfeited (in dollars per share) 48.32    
Weighted average exercise price, Exercised (in dollars per share) 29.01    
Weighted average exercise price, Outstanding at December 31, 2015 (in dollars per share) 43.47 $ 28.85  
Exercisable, Weighted Average Exercise Price (in dollars per share) 26.00    
SARs expected to vest, Weighted Average Exercise Price (in dollars per share) $ 48.92    
Weighted average remaining contractual term, options outstanding (in years) 7 years 11 months 1 day    
Weighted average remaining contractual term, options exercisable (in years) 4 years 9 months 27 days    
Aggregate intrinsic value, options outstanding $ 5.0    
Aggregate intrinsic value, options exercisable 4.0    
Aggregate intrinsic value $ 2.8 $ 10.7 $ 4.7
Restricted Stock Units (RSUs) and Performance Share Units (PSUs) [Member]      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]      
Number of shares, Outstanding at December 31, 2014 322    
Number of shares, Granted 226    
Number of shares, Vested (138)    
Number of shares, Forfeited (57)    
Number of shares, Outstanding at December 31, 2015 353 322  
Share-based Compensation Arrangement by Share-based Payment Award, Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]      
Weighted average grant date fair value, Outstanding at December 31, 2014 (in dollars per share) $ 33.14    
Weighted average grant date fair value, Granted (in dollars per share) 45.75 $ 43.21 $ 33.02
Weighted average grant date fair value, Vested (in dollars per share) 32.04    
Weighted average grant date fair value, Forfeited (in dollars per share) 35.63    
Weighted average grant date fair value, Outstanding at December 31, 2015 (in dollars per share) $ 41.23 $ 33.14  
Total fair value of shares vested $ 6.0 $ 11.6 $ 7.1