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Shareholders' Equity and Long-Term Incentive Compensation - Common Stock in Treasury, Dividends and Preferred Stock (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Common Stock in Treasury      
Retirement of treasury stock (in shares)   0  
Amount of retirement of treasury stock   $ 0.0  
Dividends      
Dividends declared     $ 30.9
Dividends paid     $ 45.9
Preferred Stock      
Authorized no par value preferred stock (in shares)   3,000,000 3,000,000
Common Stock In Treasury      
Common Stock in Treasury      
Retirement of treasury stock (in shares)   50,000,000  
Amount of retirement of treasury stock   $ 2,948.1  
Decrease in stock by the settlement of restricted stock units $ 16.9 17.9 $ 7.0
Increase in the stock for common stock surrendered by recipients of restricted stock as a means of funding minimum income tax withholding $ 0.0 $ 0.0 $ 1.8