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Stockholders' Equity - (Tables) | 9 Months Ended
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Sep. 30, 2021
Share-based Payment Arrangement [Abstract] |
Employee Equity-Based Compensation Expense |
| Quarter Ended September 30, |  | Nine Months Ended September 30,
| 2021 |  | 2020 |  | 2021 |  | 2020
Total stock-based compensation expense (selling, general and administrative and other operating charges, net) | $ | 3.8 |  |  | $ | 2.5 |  |  | $ | 6.9 |  |  | $ | 7.3 |
Income tax benefit related to stock-based compensation | $ | 1.0 |  |  | $ | 0.6 |  |  | $ | 1.8 |  |  | $ | 1.9 |
Impact on cash flow due to taxes paid related to net share settlement of equity awards and proceeds from sale of stock under employee awards | $ | — |  |  | $ | — |  |  | $ | 1.2 |  |  | $ | 0.7 |

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