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Incentive Compensation Plans Stock Option Activity (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Stock-based Payment Award      
Intrinsic value of stock options exercised $ 27.9 $ 15.1 $ 15.2
Proceeds from stock options exercised including taxes withheld 29.0 20.0 18.2
Tax withheld on stock options received $ 13.3 $ 6.8 $ 7.8
Employee Stock Option      
Stock-based Payment Award      
Stock options outstanding as of January 1, 2018 3.7    
Stock options outstanding as of Jan 1, 2018, Weighted-average exercise price $ 9.44    
Exercised (1.9) (1.1) (1.2)
Exercised, weighted-average exercise price $ 8.30    
Stock options outstanding as of December 31, 2018 1.8 3.7  
Stock options outstanding as of Dec 31, 2018, Weighted-average exercise price $ 10.66 $ 9.44  
Options outstanding, weighted average remaining contractual term 2 years 9 months    
Stock options outstanding, aggregate intrinsic value $ 17.6