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Pension Benefit Plans (Narrative) (Details) - USD ($) $ / shares in Units, $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
NAV per share, investment redemption, notice period |  | 90 days |  |
Expense for all defined benefit and defined contributions pension plans |  | $ 203.0 | $ 167.0 | $ 159.0
Pension benefit plans |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Unrecognized prior service credits, before tax |  | 4.0 |  |
Unrecognized net prior service credits, net of tax |  | 4.0 |  |
Unrecognized actuarial losses, before tax |  | (1,000.0) |  |
Unrecognized actuarial losses, net of tax |  | (789.0) |  |
Future amortization of prior service cost (credit) |  | 0.2 |  |
Future amortization of prior service cost (credit), net of tax |  | 0.2 |  |
Future amortization of gain (loss) |  | (46.0) |  |
Future amortization of gain (loss), net of tax |  | $ (36.0) |  |
Pension benefit plans | U.S. Pension Benefits |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Long-term rate of return on asset assumptions |  | 7.00% | 7.00% | 7.00%
Employer contributions |  | $ 9.7 | $ 54.7 |
Expected employer contributions within the next year |  | 95.0 |  |
Curtailment and settlement (losses) gains recognized |  | $ 0.0 | $ 0.0 |
Pension benefit plans | U.S. Pension Benefits | Scenario, forecast |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Long-term rate of return on asset assumptions | 7.00% |  |  |
Pension benefit plans | U.S. Pension Benefits | Minimum |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined benefit plan, plan assets, target allocation, percentage |  | 60.00% |  |
Pension benefit plans | U.S. Pension Benefits | Maximum |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined benefit plan, plan assets, target allocation, percentage |  | 70.00% |  |
Pension benefit plans | Non-U.S. plan |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Long-term rate of return on asset assumptions |  | 3.90% | 4.00% |
Employer contributions |  | $ 43.5 | $ 45.3 |
Expected employer contributions within the next year |  | 40.0 |  |
Curtailment and settlement (losses) gains recognized |  | (7.0) | $ 3.6 |
Curtailment and settlement (losses) gains recognized, net of tax |  | $ (6.0) |  |
Curtailment and settlement (losses) gains recognized, per diluted share |  | $ 0.01 |  |
Pension benefit plans | Non-U.S. plan | Minimum |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Long-term rate of return on asset assumptions |  | 0.80% | 1.00% |
Pension benefit plans | Non-U.S. plan | Maximum |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Long-term rate of return on asset assumptions |  | 5.00% | 5.00% |
Pension benefit plans | Non-U.S. plan | Weighted average |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Long-term rate of return on asset assumptions |  | 3.90% | 4.00% |

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