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Retirement Plans (Details) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2017 USD ($) plan | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($)
Defined Benefit Plan Disclosure [Line Items] |  |  |
Contributory defined benefit pension plans | plan | 4 |  |
Net periodic pension cost [Abstract] |  |  |
Employer service cost - benefits earned during the period | $ 1.4 | $ 2.0 | $ 4.7
Interest cost on projected benefit obligation | 10.1 | 12.3 | 14.5
Expected return on plan assets | (16.5) | (19.5) | (20.9)
Net amortization of deferrals | 2.2 | 0.7 | 4.3
Curtailment gain | 0.0 | 0.0 | 0.4
Plan settlements | 2.3 | 0.0 | 0.0
Recognized actuarial loss | 0.2 | 0.2 | 0.2
Net periodic pension (benefit) cost | (0.3) | (4.3) | 2.4
Change in benefit obligation: |  |  |
Service cost | 1.4 | 2.0 | 4.7
Interest cost | 10.1 | 12.3 | 14.5
Defined Benefit Plan, Benefit Obligation, Payment for Settlement |  | 0.0 |
Defined Benefit Plan, Accumulated Other Comprehensive (Income) Loss, before Tax [Abstract] |  |  |
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss) Arising During Period, before Tax | (3.2) | 44.2 | (25.2)
Other Comprehensive (Income) Loss, Defined Benefit Plan, Prior Service Cost (Credit), Reclassification Adjustment from AOCI, before Tax | (4.7) | (0.9) | (4.1)
other comprehensive income loss pension plans adjustment, foreign currency exchange rate changes | 8.9 | (11.7) | (3.5)
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, before Tax | 1.0 | 31.6 | (32.8)
Anticipated amount of accumulated other comprehensive loss to be recognized as net periodic pension cost in next fiscal year | 2.2 |  |
United States Retirement Plans of US Entity, Defined Contribution [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined contribution plan, cost recognized | 27.8 | 23.4 | 19.3
Foreign Retirement Plans, Defined Contribution [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined contribution plan, cost recognized | 25.5 | 27.2 | 29.0
Foreign Plan [Member] |  |  |
Net periodic pension cost [Abstract] |  |  |
Employer service cost - benefits earned during the period | 1.4 | 2.0 |
Interest cost on projected benefit obligation | 10.1 | 12.3 |
Change in benefit obligation: |  |  |
Projected benefit obligations, benefit obligation, beginning of year | 373.9 | 358.5 |
Service cost | 1.4 | 2.0 |
Interest cost | 10.1 | 12.3 |
Defined Benefit Plan, Benefit Obligation, Payment for Settlement | (8.1) |  |
Defined Benefit Plan, Benefit Obligation, Contributions by Plan Participant | 0.1 | 0.1 |
Defined Benefit Plan, Benefit Obligation, Benefits Paid | 11.1 | 16.2 |
Actuarial (gain) loss | (0.5) | 80.7 |
Changes in currency translation rates | 37.0 | (62.1) |
Defined Benefit Plan, Benefit Obligation, Increase (Decrease) for Other Change | (0.6) | (1.4) |
Projected benefit obligations, benefit obligation, end of year | 402.2 | 373.9 | 358.5
Change in plan assets: |  |  |
Fair value of plan assets, benefit obligation, beginning of year | 364.9 | 384.9 |
Actual return on plan assets | 18.7 | 52.6 |
Defined Benefit Plan, Plan Assets, Payment for Settlement | (8.1) | 0.0 |
Defined Benefit Plan, Plan Assets, Contributions by Employer | 8.1 | 8.4 |
Defined Benefit Plan, Plan Assets, Benefits Paid | 11.1 | 16.2 |
Changes in currency translation rates | 36.9 | (63.4) |
Other | (0.5) | (1.4) |
Fair value of plan assets, benefit obligation, end of year | 408.9 | 364.9 | $ 384.9
Funded status and net amount recognized | 6.7 | (9.0) |
Accumulated benefit obligation, December 31, | 402.2 | 373.9 |
Foreign Plan [Member] |  |  |
Change in plan assets: |  |  |
Fair value of plan assets, benefit obligation, beginning of year | 364.9 |  |
Fair value of plan assets, benefit obligation, end of year | 408.9 | 364.9 |
Funded status and net amount recognized | 6.7 | (9.0) |
Defined Benefit Plan, Amounts for Asset (Liability) Recognized in Statement of Financial Position [Abstract] |  |  |
Assets for Plan Benefits, Defined Benefit Plan | 22.4 | 11.2 |
Pension assets (included in Other assets) | (15.7) | (20.2) |
Accumulated other comprehensive income yet to be recognized as components of net periodic pension cost, actuarial losses | 91.9 | 90.8 |
Accumulated other comprehensive income yet to be recognized as components of net periodic pension cost, prior service cost | 0.3 | 0.4 |
Accumulated other comprehensive loss | 92.2 | 91.2 |
Allocation of Pension Plan Assets |  |  |
Defined Benefit Plan, Equity Securities, Amount | 105.7 | 112.6 |
Defined Benefit Plan, Debt Securities, Corporate Bonds, Amount | 155.7 | 124.9 |
Defined Benefit Plan, Debt Securities, Government and Other Debt Securities, Amount | 25.3 | 17.5 |
Defined Benefit Plan, Plan Assets, Other, Amount | 41.6 | 35.6 |
Defined Benefit Plan, Fair Value of Plan Assets, Excluding Cash and Cash Equivalents and Assets Measured at NAV | 328.3 | 290.6 |
Defined Benefit Plan, Cash and Cash Equivalents, Amount | 3.4 | 6.6 |
Defined Benefit Plan, Assets Measured at NAV, Amount | 77.2 | $ 67.7 |
Defined Benefit Plan, Expected Future Benefit Payment [Abstract] |  |  |
Defined benefit plan, estimated future employer contributions in next fiscal year | 8.3 |  |
2018 | 20.5 |  |
2019 | 21.2 |  |
2020 | 21.7 |  |
2021 | 22.4 |  |
2022 | 23.0 |  |
2023 to 2027 | 125.4 |  |
Total | $ 234.2 |  |
Foreign Plan [Member] | Minimum [Member] |  |  |
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract] |  |  |
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Discount Rate | 2.00% | 2.00% |
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Rate of Compensation Increase | 0.00% | 0.00% |
Discount rate used in determining present values | 2.00% | 2.00% | 2.25%
Annual increase in future compensation levels | 0.00% | 0.00% | 0.00%
Expected long-term rate of return on assets | 2.30% | 2.00% | 2.70%
Foreign Plan [Member] | Maximum [Member] |  |  |
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract] |  |  |
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Discount Rate | 2.55% | 2.70% |
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Rate of Compensation Increase | 3.75% | 3.65% |
Discount rate used in determining present values | 2.70% | 3.90% | 3.70%
Annual increase in future compensation levels | 3.65% | 3.50% | 3.50%
Expected long-term rate of return on assets | 4.90% | 5.90% | 5.80%
Foreign Plan [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |
Change in plan assets: |  |  |
Fair value of plan assets, benefit obligation, beginning of year | $ 252.6 |  |
Fair value of plan assets, benefit obligation, end of year | 277.6 | $ 252.6 |
Allocation of Pension Plan Assets |  |  |
Defined Benefit Plan, Equity Securities, Amount | 105.7 | 112.6 |
Defined Benefit Plan, Debt Securities, Corporate Bonds, Amount | 150.5 | 121.3 |
Defined Benefit Plan, Debt Securities, Government and Other Debt Securities, Amount | 17.8 | 14.8 |
Defined Benefit Plan, Plan Assets, Other, Amount | 3.6 | 3.9 |
Foreign Plan [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |
Change in plan assets: |  |  |
Fair value of plan assets, benefit obligation, beginning of year | 8.8 |  |
Fair value of plan assets, benefit obligation, end of year | 19.7 | 8.8 |
Allocation of Pension Plan Assets |  |  |
Defined Benefit Plan, Equity Securities, Amount | 0.0 |  |
Defined Benefit Plan, Debt Securities, Corporate Bonds, Amount | 5.2 | 3.6 |
Defined Benefit Plan, Debt Securities, Government and Other Debt Securities, Amount | 7.5 | 2.7 |
Defined Benefit Plan, Plan Assets, Other, Amount | 7.0 | 2.5 |
Foreign Plan [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |
Change in plan assets: |  |  |
Fair value of plan assets, benefit obligation, beginning of year | 29.2 |  |
Fair value of plan assets, benefit obligation, end of year | 31.0 | 29.2 |
Allocation of Pension Plan Assets |  |  |
Defined Benefit Plan, Equity Securities, Amount | 0.0 | 0.0 |
Defined Benefit Plan, Debt Securities, Corporate Bonds, Amount | 0.0 |  |
Defined Benefit Plan, Debt Securities, Government and Other Debt Securities, Amount | 0.0 | 0.0 |
Defined Benefit Plan, Plan Assets, Other, Amount | $ 31.0 | $ 29.2 |

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