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Pension Benefits - Narrative (Details) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2021 USD ($) employees | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($)
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined contribution plan, cost | $ 28.9 | $ 26.1 | $ 26.0
Payment for Pension Benefits | $ 0.0 | 0.0 | 55.3
Pension and Other Postretirement Benefits Expense (Reversal of Expense), Noncash |  | 50.6 |
Pension Plans, Defined Benefit |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Number of participants and beneficiaries | employees | 3,145 |  |
Contribution as a percentage of compensation | 3.00% |  |
Actuarial loss amortization period | 27 years |  |
Amounts that will be amortized from AOCI in next fiscal Year | $ 3.7 |  |
Employer Contributions | 0.0 | 0.0 |
Unfunded liability | (12.9) | (23.1) |
Pension expense | 0.6 | 58.6 | (5.4)
Unrecognized pension gain (loss) arising during the year | 6.0 | 7.8 | (4.2)
Payment for Pension Benefits |  | 117.1 |
Supplemental Employee Retirement Plan |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Unfunded liability | 28.0 | 30.7 |
Pension expense | 0.7 | 0.8 | 1.0
Unrecognized pension gain (loss) arising during the year | $ 1.3 | (2.7) | $ (5.6)
Terminal Funding Annuity |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Proceeds from Annuities and Investment Certificates |  | $ 205.4 |

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