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Stock-Based Compensation Outstanding Options and SSARs (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Millions
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested [Roll Forward]        
Beginning balance 5,739 7,004 6,937  
Options / SSARs granted 509 378 494  
Options / SSARs exercised (1,593) (1,334) (43)  
Options / SSARs cancelled (426) (309) (384)  
Ending balance 4,229 5,739 7,004  
Options / SSARs outstanding Weighted Average Exercise Price $ 15.84 $ 14.54 $ 14.19 $ 14.26
SSARs granted Weighted Average Exercise Price 15.74 17.04 18.09  
Options / SSARs exercised Weighted Average Exercise Price 7.84 10.76 9.92  
Options / SSARs cancelled Weighted Average Exercise Price $ 28.18 $ 25.83 $ 21.14  
Options / SSARs outstanding Weighted Average Contractual Term (in years) 4 years 4 months 6 days      
Options / SSARs outstanding Aggregate Intrinsic Value (in millions) $ 17.4      
Vested and expected to vest [1] 4,181      
Vested and expected to vest Aggregate Intrinsic Value (in millions) [1] $ 17.3      
Options / SSARs exercisable 3,352      
Share Based Compensation Arrangement by Share Based Payment Award, Options And Ssars, Exercisable, Weighted Average Exercise Price $ 15.68      
Share Based Compensation Arrangement by Share Based Payment Award, Options And Ssars, Exercisable, Weighted Average Remaining Contractual Term 3 years 3 months 18 days      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Weighted Average Remaining Contractual Term 4 years 3 months 29 days      
Options / SSARs exercisable Aggregate Intrinsic Value (in millions) $ 15.3      
Restricted Stock Units (RSUs) [Member]        
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested [Roll Forward]        
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Weighted Average Remaining Contractual Term 1 year 18 days      
Weighted-average period of years costs are expected to be recognied over 1 year 4 days      
Allocated Share-based Compensation Expense $ 4.7 $ 3.5 $ 3.0  
Unrecognized compensation costs 4.0      
Options and Ssars [Member]        
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested [Roll Forward]        
Allocated Share-based Compensation Expense 4.6 $ 3.6 $ 3.8  
Unrecognized compensation costs $ 2.5      
Shares available under stock award plans 3,300      
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 11 months 5 days      
[1] xpected to vest based upon historical forfeiture rate