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Stockholders' Equity - (Tables) | 6 Months Ended
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Jun. 30, 2021
Share-based Payment Arrangement [Abstract] |
Employee Equity-Based Compensation Expense |
| Three Months Ended June 30, |  | Six Months Ended June 30,
| 2021 |  | 2020 |  | 2021 |  | 2020
Total stock-based compensation expense (selling, general and administrative and other operating charges, net) | $ | 0.7 |  |  | $ | 3.4 |  |  | $ | 3.1 |  |  | $ | 4.8 |
Income tax benefit related to stock-based compensation | $ | 0.2 |  |  | $ | 0.9 |  |  | $ | 0.8 |  |  | $ | 1.3 |
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 | $ | 0.1 |  |  | $ | — |  |  | $ | 1.2 |  |  | $ | 0.7 |

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