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Earnings Per Common Share (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Numerator:    
Income from continuing operations, net of loss attributable to non-controlling interest $ 28.8 $ 25.9
Denominator:    
Denominator for basic earnings per common share-weighted average shares (in shares) 54.7 54.3
Effect of dilutive securities:    
Employee stock-based compensation (in shares) 1.0 0.6
Denominator for diluted earnings per common share-adjusted weighted average shares 55.7 54.9
Basic earnings per share for continuing operations (in dollars per share) $ 0.53 $ 0.48
Diluted earnings per share for continuing operations (in dollars per share) $ 0.52 $ 0.47
Shares excluded from diluted earnings per common share computation as anti-dilutive (in shares) 1.2 1.5