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Retirement Benefits - Narrative (Details) $ in Millions | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Mar. 31, 2020 USD ($) | Dec. 31, 2021 USD ($) employee shares | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($) | Sep. 30, 2019 employee
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Actuarial loss (gain) |  | $ 9.7 |  |  |
Deferred pension cost (reversal of cost) |  | 10.7 |  |  |
Plan assets, period increase (decrease) |  | 1.0 |  |  |
Funded status |  | 10.2 |  |  |
Accumulated benefit obligation for all defined benefit pension plans |  | $ 110.7 | $ 204.4 |  |
Percentage of excess gains and losses over benefit obligation or market value of assets amortized |  | 10.00% |  |  |
Costs of defined contribution plans |  | $ 12.8 | 12.5 | $ 12.4 |
Number of participants covering under multi employer pension plan | employee |  | 212 |  |  |
Costs of bargaining unit-sponsored multi-employer plans and defined contribution plans |  | $ 1.0 | 1.1 | 1.1 |
Weighted average annual rate of increase in the per capita cost of covered health care benefits assumed |  | 5.45% |  |  |
Assumed decrease of weighted average health care cost trend rate |  | 4.45% |  |  |
Year that reaches assumed decrease of weighted average health care cost trend rate |  | 2040 |  |  |
Stock held in plan assets (in shares) | shares |  | 0 |  |  |
Estimated Future Benefit Payments |  |  |  |  |
2022 |  | $ 6.4 |  |  |
2023 |  | 6.0 |  |  |
2024 |  | 6.0 |  |  |
2025 |  | 6.3 |  |  |
2026 |  | 6.3 |  |  |
2027 to 2031 |  | 31.8 |  |  |
Other (Income) Expense Net |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Settlement loss recognized | $ 0.9 |  |  | 0.7 |
Net periodic benefit cost |  |  | 1.0 |  |
Defined Contribution Plan |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Defined contribution plan, expected contribution for next fiscal year |  | 15.1 |  |  |
401k |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Defined contribution plan, expected contribution for next fiscal year |  | $ 10.2 |  |  |
U.S. | Equity Securities |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Target allocation of fund assets in equities |  | 10.00% |  |  |
U.S. | Fixed Income Securities | Minimum |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Target allocation of fund assets in equities |  | 90.00% |  |  |
UK | Equity Securities |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Target allocation of fund assets in equities |  | 62.00% |  |  |
UK | Equity Securities | Minimum |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Target allocation of fund assets in equities |  | 60.00% |  |  |
UK | Equity Securities | Maximum |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Target allocation of fund assets in equities |  | 65.00% |  |  |
UK | Fixed Income Securities |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Target allocation of fund assets in equities |  | 38.00% |  |  |
UK | Fixed Income Securities | Minimum |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Target allocation of fund assets in equities |  | 35.00% |  |  |
UK | Fixed Income Securities | Maximum |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Target allocation of fund assets in equities |  | 40.00% |  |  |
Pension Benefits |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Participants affected due to plan freeze | employee |  |  |  |  | 60
Defined benefit plan, expected contribution for next fiscal year |  | $ 4.0 |  |  |
Pension Benefits | U.S. |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Settlement loss recognized |  | 10.5 | 0.9 | 0.7 |
Net periodic benefit cost |  | (10.4) | 0.3 | (2.7) |
Actuarial loss (gain) |  | 1.9 | (6.5) |  |
Funded status |  | 6.4 | 6.0 |  |
Pension Benefits | Non-U.S. |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Settlement loss recognized |  | 0.0 | (0.4) | 0.0 |
Net periodic benefit cost |  | (3.8) | (3.4) | $ (3.4) |
Actuarial loss (gain) |  | 5.3 | (7.3) |  |
Funded status |  | $ (58.2) | (73.5) |  |
Pension Benefits | UK |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Target allocation of fund assets in equities |  | 3.10% |  |  |
Other Benefits |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Actuarial loss (gain) |  | $ 0.8 | (3.2) |  |
Funded status |  | (23.6) | $ (24.2) |  |
Defined benefit plan, expected contribution for next fiscal year |  | $ 1.2 |  |  |

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