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Other Financial Statement Disclosures - Accrued Liabilities (Details) - USD ($) $ in Millions | Mar. 31, 2019 | Dec. 31, 2018
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Other Financial Statement Disclosures [Abstract] |  |
Pension and other postretirement benefits | $ 15.8 | $ 16.8
Compensation and related employee costs | 37.3 | 45.0
Interest | 39.6 | 34.0
Income taxes | 6.2 | 7.1
Operating Lease, Liability, Current | 3.5 | 0.0
Other | 13.3 | 10.5
Total accrued liabilities | $ 115.7 | $ 113.4

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