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Pension and Other Postretirement Benefit Plans - Narrative (Details) $ in Millions | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Dec. 31, 2020 USD ($) pension_plan agreement | Oct. 03, 2020 USD ($) | Dec. 31, 2020 USD ($) pension_plan agreement | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($) | Dec. 31, 2021 USD ($)
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Accumulated benefit obligation | $ 1,079.6 |  | $ 1,079.6 | $ 990.3 |  |
Tax (expense) benefit related to defined benefit plans recognized in other comprehensive income (loss) |  |  | 18.5 | 13.7 | $ (3.0) |
Defined benefit plan, loss due to settlement | 2.7 | $ 10.2 | 12.9 |  |  |
Charges | $ 8.1 |  | $ 132.0 | 194.2 | 88.0 |
Number of multi-employer pension plans | pension_plan | 2 |  | 2 |  |  |
Number of collective bargaining agreements | agreement | 4 |  | 4 |  |  |
Defined Contribution Retirement Program |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Defined contribution expense |  |  | $ 18.3 | $ 17.6 | 21.5 |
Unionized Employees | Multi-employer Plan Total Contributions |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Concentration risk percentage (more than) |  |  | 5.00% | 5.00% |  |
Pension Benefit Plan Curtailment Gain |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Charges |  |  |  | $ 10.6 |  |
U.S. | Minimum |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Debt, weighted average interest rate | 4.00% |  | 4.00% | 4.00% |  |
Foreign |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Defined contribution expense |  |  | $ 17.1 | $ 14.0 | 13.7 |
Pension | Minimum |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Period for amortizing actuarial losses |  |  | 4 years |  |  |
Pension | Minimum | Forecast |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Estimated required contributions to pension plans in next fiscal year |  |  |  |  |  | $ 5.0
Pension | Maximum |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Period for amortizing actuarial losses |  |  | 34 years |  |  |
Pension | Maximum | Forecast |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Estimated required contributions to pension plans in next fiscal year |  |  |  |  |  | $ 10.0
Pension | U.S. |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Defined benefit plan, loss due to settlement |  |  | $ 0.3 | 0.1 | 5.7 |
Settlement charge |  |  |  |  | 5.4 |
Pension | U.S. | Minimum | Return Seeking Assets |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Target percentage of asset allocation | 45.00% |  | 45.00% |  |  |
Pension | U.S. | Minimum | Risk Mitigating Assets |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Target percentage of asset allocation | 35.00% |  | 35.00% |  |  |
Pension | U.S. | Maximum | Return Seeking Assets |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Target percentage of asset allocation | 65.00% |  | 65.00% |  |  |
Pension | U.S. | Maximum | Risk Mitigating Assets |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Target percentage of asset allocation | 55.00% |  | 55.00% |  |  |
Pension | Foreign |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Defined benefit plan, loss due to settlement |  |  | $ 13.0 | $ 0.0 | $ 0.0 |
Pension | Foreign | Minimum | Equity Securities |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Target percentage of asset allocation | 45.00% |  | 45.00% |  |  |
Pension | Foreign | Minimum | Fixed Income |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Target percentage of asset allocation | 25.00% |  | 25.00% |  |  |
Pension | Foreign | Minimum | Alternative Investments |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Target percentage of asset allocation | 0.00% |  | 0.00% |  |  |
Pension | Foreign | Minimum | Cash and Other |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Target percentage of asset allocation | 0.00% |  | 0.00% |  |  |
Pension | Foreign | Maximum | Equity Securities |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Target percentage of asset allocation | 65.00% |  | 65.00% |  |  |
Pension | Foreign | Maximum | Fixed Income |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Target percentage of asset allocation | 45.00% |  | 45.00% |  |  |
Pension | Foreign | Maximum | Alternative Investments |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Target percentage of asset allocation | 25.00% |  | 25.00% |  |  |
Pension | Foreign | Maximum | Cash and Other |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Target percentage of asset allocation | 15.00% |  | 15.00% |  |  |
Other Postretirement | Minimum |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Period for amortizing actuarial losses |  |  | 1 year |  |  |
Other Postretirement | Maximum |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Period for amortizing actuarial losses |  |  | 17 years |  |  |

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