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Retirement and Other Postretirement Benefit Plans - Schedule of Amounts Recognized on Balance Sheet (Details) - USD ($) $ in Millions | Jun. 30, 2018 | Dec. 31, 2017 | Jun. 30, 2017
--- | --- | --- | ---
Defined Benefit Retirement Plans | U.S. |  |  |
Amounts recognized on the balance sheet: |  |  |
Accrued liabilities | $ 4.8 | $ 4.5 |
Other non-current liabilities | 17.4 | 16.9 |
Total accrued benefit | $ 22.2 | $ 21.4 |
Defined Benefit Plan, Tax Status [Extensible List] | us-gaap:NonqualifiedPlanMember | us-gaap:NonqualifiedPlanMember | us-gaap:NonqualifiedPlanMember
Defined Benefit Retirement Plans | European |  |  |
Amounts recognized on the balance sheet: |  |  |
Noncurrent asset | $ 36.6 | $ 32.2 |
Accrued liabilities | 1.2 | 0.3 |
Other non-current liabilities | 20.7 | 19.6 |
Total accrued benefit | 21.9 | 19.9 |
Postretirement Health Care and Life Insurance Benefit Plans |  |  |
Amounts recognized on the balance sheet: |  |  |
Accrued liabilities | 0.5 | 0.5 |
Other non-current liabilities | 3.2 | 3.6 |
Total accrued benefit | $ 3.7 | $ 4.1 |

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