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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, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Tax benefit | $ (0.3) | $ (0.4) | $ (0.7) | $ (0.7)
Stock-based compensation expense, net of tax | 5.8 | 5.1 | 11.2 | 10.1
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 expenses, before income taxes | $ 6.1 | $ 5.5 | $ 11.9 | $ 10.8

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