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Stock-Based Compensation Outstanding Options and SSARs (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, Equity Instruments Other than Options, Nonvested [Roll Forward]      
Beginning balance 4,229,247    
Options / SSARs granted 286,000    
Options / SSARs exercised (1,094,000)    
Options / SSARs cancelled (993,752)    
Options/ SSARs forfeited (23,068)    
Ending balance 2,405,000 4,229,247  
Vested and expected to vest [1] 2,285,000    
Options / SSARs exercisable 1,703,031,000    
Options / SSARs outstanding Weighted Average Exercise Price $ 14.76 $ 15.84  
SSARs granted Weighted Average Exercise Price 19.14    
Options / SSARs exercised Weighted Average Exercise Price 12.79    
Options / SSARs cancelled Weighted Average Exercise Price 22.94    
Share Based Compensation Arrangement by Share Based Payment Award, Options And Ssars, Forfeitures in Period, Weighted Average Exercise Price $ 16.54    
Options / SSARs outstanding Weighted Average Contractual Term (in years) 5 years 10 months 6 days    
Share Based Compensation Arrangement by Share Based Payment Award, Options And Ssars, Outstanding, Intrinsic Value $ 27.7    
Vested and expected to vest, weighted average term 5 years 10 months 6 days    
Vested and expected to vest Aggregate Intrinsic Value (in millions) [1] $ 27.5    
Share Based Compensation Arrangement by Share Based Payment Award, Options And Ssars, Exercisable, Weighted Average Exercise Price $ 13.70    
Share Based Compensation Arrangement by Share Based Payment Award, Options And Ssars, Exercisable, Weighted Average Remaining Contractual Term 4 years 9 months 26 days    
Options / SSARs exercisable Aggregate Intrinsic Value (in millions) $ 21.4    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value 26.5 $ 29.8 $ 23.9
Options and Ssars [Member]      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested [Roll Forward]      
Unrecognized compensation costs 2.0    
Allocated Share-based Compensation Expense $ 2.5 $ 4.6 $ 3.6
Options and Ssars [Member]      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested [Roll Forward]      
Weighted-average period of years costs are expected to be recognied over 1 year 6 months    
[1] xpected to vest based upon historical forfeiture rate