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Other Noncurrent Liabilities (Tables) | 3 Months Ended
--- | ---
Mar. 31, 2018
Other Liabilities Disclosure [Abstract] |
Components of Other Noncurrent Liabilities |
| December 31, |  |  | March 31, |
| 2017 |  |  | 2018 |
| (In millions) |
Employee benefits | $ | 8.5 |  |  | $ | 8.9 |
Other |  | 13.0 |  |  |  | 13.7 |
Total | $ | 21.5 |  |  | $ | 22.6 |

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