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Net Income per Common Share (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Basic net income per common share:        
Net income $ 61.6 $ 66.1 $ 126.2 $ 122.1
Weighted average common shares outstanding — Basic (in shares) 90.7 93.1 91.1 93.3
Basic net income per common share $ 0.68 $ 0.71 $ 1.39 $ 1.31
Diluted net income per common share:        
Net income $ 61.6 $ 66.1 $ 126.2 $ 122.1
Weighted average common shares outstanding — Basic (in shares) 90.7 93.1 91.1 93.3
Plus incremental shares from assumed conversions:        
Restricted stock units (in shares) 0.4 0.5 0.4 0.4
Stock options (in shares) 0.9 1.0 0.9 1.0
Weighted average common shares outstanding — Dilutive (in shares) 92.0 94.6 92.4 94.7
Diluted net income per common share $ 0.67 $ 0.70 $ 1.37 $ 1.29