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Retirement Plans (Details) $ in Millions | 12 Months Ended
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Dec. 31, 2018 USD ($) plan | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($)
Defined Benefit Plan Disclosure [Line Items] |  |  |
Contributory defined benefit pension plans | plan | 5 |  |
United States Retirement Plans of US Entity, Defined Contribution [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined contribution plan, cost recognized | $ 28.8 | $ 27.8 | $ 23.4
Foreign Retirement Plans, Defined Contribution [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined contribution plan, cost recognized | 30.7 | 25.5 | $ 27.2
Foreign Plan [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Plan Assets, Amount | 384.3 | 408.9 |
Defined Benefit Plan, Funded (Unfunded) Status of Plan | 18.7 | 6.7 |
Change in benefit obligation ($ in millions): |  |  |
Projected benefit obligations, benefit obligation, end of year | 365.6 | 402.2 |
Change in plan assets: |  |  |
Defined Benefit Plan, Accumulated Benefit Obligation | 365.6 | 402.2 |
Foreign Plan [Member] |  |  |
Defined Benefit Plan, Amounts for Asset (Liability) Recognized in Statement of Financial Position [Abstract] |  |  |
Assets for Plan Benefits, Defined Benefit Plan | 25.2 | 22.4 |
Pension assets (included in Other assets) | (6.5) | (15.7) |
Defined Benefit Plan, Accumulated Other Comprehensive (Income) Loss, before Tax | $ 84.7 | $ 92.2 |

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