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Stock-Based Compensation - Schedule of Allocation of Share-based Compensation Costs by Plan (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Tax benefit $ (0.4) $ (0.4) $ (0.7) $ (0.7)
Stock-based compensation expense, net of tax 5.1 5.2 10.1 9.9
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 $ 5.5 $ 5.6 $ 10.8 $ 10.6