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Earnings Per Common Share (Details) - USD ($)
$ / shares in Units, $ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Numerator:        
Income from continuing operations, net of loss attributable to non-controlling interest $ 72.5 $ 45.0 $ 144.1 $ 99.1
Denominator:        
Denominator for basic earnings per common share-weighted average shares (in shares) 54,600,000 54,500,000 54,700,000 54,400,000
Effect of dilutive securities:        
Employee stock-based compensation (in shares) 1,200,000 600,000 1,300,000 600,000
Denominator for diluted earnings per common share-adjusted weighted average shares 55,800,000 55,100,000 56,000,000.0 55,000,000.0
Basic earnings per share for continuing operations (in dollars per share) $ 1.33 $ 0.83 $ 2.63 $ 1.82
Diluted earnings per share for continuing operations (in dollars per share) $ 1.30 $ 0.82 $ 2.57 $ 1.80
Shares excluded from diluted earnings per common share computation as anti-dilutive (in shares) 0 1,400,000 1,100,000 1,500,000