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Retirement Benefit Plans (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017 | Dec. 31, 2018
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Actual contribution to defined benefit pension plans |  |  | $ 12.3 |  |
Scenario, Forecast [Member] | Minimum [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Defined Benefit Plan, Expected Future Employer Contributions, Current Fiscal Year |  |  |  |  | $ 15.0
Scenario, Forecast [Member] | Maximum [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Defined Benefit Plan, Expected Future Employer Contributions, Current Fiscal Year |  |  |  |  | $ 25.0
Other Postretirement Benefits Plan [Member] |  |  |  |  |
Components of net periodic benefit cost: |  |  |  |  |
Service cost | $ 0.1 | $ 0.0 | 0.1 | $ 0.1 |
Interest cost | 0.7 | 0.8 | 2.1 | 2.4 |
Expected return on plan assets | 0.0 | 0.0 | 0.0 | 0.0 |
Amortization of unrecognized prior service credit | (1.1) | (1.1) | (3.1) | (3.1) |
Amortization of unrecognized loss | 0.3 | 0.4 | 0.9 | 1.0 |
Net periodic benefit (income) cost | 0.0 | 0.1 | 0.0 | 0.4 |
Pension Plan [Member] | UNITED STATES |  |  |  |  |
Components of net periodic benefit cost: |  |  |  |  |
Service cost | 0.0 | 0.0 | 0.0 | 0.0 |
Interest cost | 2.1 | 2.2 | 6.4 | 6.6 |
Expected return on plan assets | (3.4) | (3.3) | (10.3) | (9.8) |
Amortization of unrecognized prior service credit | (0.2) | (0.2) | (0.6) | (0.6) |
Amortization of unrecognized loss | 1.0 | 1.1 | 3.1 | 3.2 |
Net periodic benefit (income) cost | (0.5) | (0.2) | (1.4) | (0.6) |
Pension Plan [Member] | Non-US [Member] |  |  |  |  |
Components of net periodic benefit cost: |  |  |  |  |
Service cost | 4.4 | 4.5 | 13.5 | 13.3 |
Interest cost | 3.0 | 2.8 | 9.1 | 8.0 |
Expected return on plan assets | (6.7) | (6.0) | (20.6) | (17.4) |
Amortization of unrecognized prior service credit | 0.0 | 0.0 | 0.0 | 0.0 |
Amortization of unrecognized loss | 1.7 | 2.0 | 5.3 | 5.8 |
Net periodic benefit (income) cost | $ 2.4 | $ 3.3 | $ 7.3 | $ 9.7 |

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