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Pension Benefits - Narrative (Details) $ in Millions |  |  | 12 Months Ended
--- | --- | --- | ---
Aug. 22, 2019 USD ($) | Jul. 13, 2018 USD ($) | Dec. 31, 2019 USD ($) employees | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($)
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Employer Contributions | $ 55.3 | $ 5.1 |  |  |
Unrecognized pension gain (loss) arising during the year |  |  | $ (4.8) | $ (8.0) | $ 3.9
Defined contribution plan, cost |  |  | $ 26.0 | 15.1 | 10.6
Pension Plans, Defined Benefit |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Number of participants and beneficiaries | employees |  |  | 8,650 |  |
Number of active employees | employees |  |  | 1,250 |  |
Contribution as a percentage of compensation |  |  | 3.00% |  |
Actuarial loss amortization period |  |  | 22 years |  |
Amounts that will be amortized from AOCI in next fiscal Year |  |  | $ 5.9 |  |
Employer Contributions |  |  | 55.3 | 5.1 |
Unfunded liability |  |  | (4.1) | 55.2 |
Pension expense |  |  | (5.4) | (4.3) | (7.7)
Unrecognized pension gain (loss) arising during the year |  |  | (4.2) | (11.5) | 4.9
Supplemental Employee Retirement Plan |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Unfunded liability |  |  | 28.9 | 24.2 |
Pension expense |  |  | 1.0 | 0.8 | 0.8
Unrecognized pension gain (loss) arising during the year |  |  | $ (5.6) | $ 1.3 | $ (1.6)

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