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, 2021 |
Sep. 30, 2020 |
Sep. 30, 2021 |
Sep. 30, 2020 |
|
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | ||||
Tax benefit | $ (0.3) | $ (0.3) | $ (1.0) | $ (1.0) |
Stock-based compensation expense, net of tax | 6.9 | 5.1 | 19.7 | 16.3 |
Stock-based compensation expenses (RSUs and PRSUs), before income taxes | ||||
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | ||||
Stock-based compensation expenses, before income taxes | $ 7.2 | $ 5.4 | $ 20.7 | $ 17.3 |