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Pension Benefits - Narrative (Details) $ in Millions |  |  | 12 Months Ended
--- | --- | --- | ---
Aug. 22, 2019 USD ($) | Jul. 13, 2018 USD ($) | Dec. 31, 2020 USD ($) employees | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($)
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Employer Contributions | $ 55.3 | $ 5.1 |  |  |
Defined contribution plan, cost |  |  | $ 26.1 | $ 26.0 | $ 15.1
Payment for Pension Benefits |  |  | 0.0 | 55.3 | 5.1
Payment for Pension Benefits |  |  | 0.0 | 55.3 | 5.1
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 |  |  | 3,175 |  |
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 |  |  | $ 3.0 |  |
Employer Contributions |  |  | 0.0 | 55.3 |
Unfunded liability |  |  | (23.1) | (4.1) |
Pension expense |  |  | 58.6 | (5.4) | (4.3)
Unrecognized pension gain (loss) arising during the year |  |  | 7.8 | (4.2) | (11.5)
Payment for Pension Benefits |  |  | 117.1 |  |
Payment for Pension Benefits |  |  | 117.1 |  |
Supplemental Employee Retirement Plan |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Unfunded liability |  |  | 30.7 | 28.9 |
Pension expense |  |  | 0.8 | 1.0 | 0.8
Unrecognized pension gain (loss) arising during the year |  |  | (2.7) | $ (5.6) | $ 1.3
Terminal Funding Annuity [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Proceeds from Annuities and Investment Certificates |  |  | 205.4 |  |
Proceeds from Annuities and Investment Certificates |  |  | $ 205.4 |  |

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- Definition Defined Benefit Pension Plan, Number of Participants and Beneficiaries + References No definition available. + Details
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- Definition Amount of contribution received by defined benefit plan from employer which increases plan assets. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=118257860&loc=d3e4179-114921 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(iv)(01) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 6 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e2709-114920 Reference 4: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(ii) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 Reference 5: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 18 -URI http://asc.fasb.org/extlink&oid=118257860&loc=d3e4587-114921 Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(iv)(01) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 Reference 7: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b)(3) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 + Details
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