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Employee Benefits - Accumulated Benefit Obligations (Details) - USD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019
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Pension Plan |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Accumulated benefit obligation | $ 3,194.3 | $ 2,992.9
Information for pension or OPEB plans with an accumulated benefit obligation in excess of plan assets |  |
Accumulated benefit obligation | 1,555.5 | 1,754.2
Fair value of plan assets | 1,298.3 | 1,504.6
Information for pension plans with a projected benefit obligation in excess of plan assets |  |
Projected benefit obligation | 2,034.1 | 1,810.1
Fair value of plan assets | 1,729.8 | 1,504.6
OPEB Benefits |  |
Information for pension or OPEB plans with an accumulated benefit obligation in excess of plan assets |  |
Accumulated benefit obligation | 25.7 | 31.1
Fair value of plan assets | $ 3.0 | $ 10.4

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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 http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 + Details
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