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Employee Benefits - Accumulated Benefit Obligations (Details) - USD ($) $ in Millions | Dec. 31, 2022 | Dec. 31, 2021
--- | --- | ---
Pension Plan |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Accumulated benefit obligation | $ 2,250.6 | $ 3,010.5
Information for pension or OPEB plans with an accumulated benefit obligation in excess of plan assets |  |
Accumulated benefit obligation | 185.7 | 372.4
Fair value of plan assets | 32.8 | 186.3
Information for pension plans with a projected benefit obligation in excess of plan assets |  |
Projected benefit obligation | 191.3 | 383.0
Fair value of plan assets | 32.8 | 186.3
OPEB Benefits |  |
Information for pension or OPEB plans with an accumulated benefit obligation in excess of plan assets |  |
Accumulated benefit obligation | 20.6 | 25.1
Fair value of plan assets | $ 7.4 | $ 2.8

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- Definition Amount of actuarial present value of benefits attributed to employee service rendered, excluding assumptions about future compensation level. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (e) -URI https://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 + Details
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- Definition Amount of projected benefit obligation for defined benefit pension plan with projected benefit obligation in excess of plan assets. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (a) -URI https://asc.fasb.org/extlink&oid=123447040&loc=d3e2417-114920 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 17 -URI https://asc.fasb.org/extlink&oid=123450688&loc=d3e4179-114921 + Details
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