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Stock-Based Compensation - Schedule of Allocation of Share-based Compensation Costs by Plan (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Tax benefit $ (0.4) $ (0.4) $ (1.1) $ (1.1)
Stock-based compensation expense, net of tax 5.2 4.4 15.3 14.3
Stock-based compensation expenses (restricted share units (“RSUs”) and performance-based RSUs (“PRSUs”)), before income taxes        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock-based compensation expense, before income taxes $ 5.6 $ 4.8 $ 16.4 $ 15.4