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Employee Benefit Plans and Other Postretirement Benefits - Change in Benefit Obligations and Change in Fair Value of Plan Assets Related to Pension and Postretirement Plans (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Change in Fair Value of Plan Assets [Roll Forward] |  |  |  |
Plan assets at fair value at beginning of period |  | $ 1,300.0 |  |
Fair value of plan assets at plan year end |  | 1,100.0 | $ 1,300.0 |
Amounts Recognized on Consolidated Balance Sheets: |  |  |  |
Noncurrent liabilities |  | (141.8) | (157.4) |
Pension Plan [Member] |  |  |  |
Change in Benefit Obligations [Roll Forward] |  |  |  |
Benefit obligation at beginning of period |  | 1,503.8 | 1,565.6 |
Service cost |  | 19.3 | 21.4 | $ 23.0
Interest cost |  | 34.7 | 29.6 | 39.8
Plan amendments |  | 15.1 | 2.1 |
Actuarial (gain) loss | [1] | (348.0) | (61.1) |
Participant contributions |  | 0.0 | 0.0 |
Benefits paid |  | (57.8) | (53.8) |
Benefit obligation at plan year end |  | 1,167.1 | 1,503.8 | 1,565.6
Accumulated benefit obligation portion of above |  | 1,131.0 | 1,464.8 |
Change in Fair Value of Plan Assets [Roll Forward] |  |  |  |
Plan assets at fair value at beginning of period |  | 1,382.7 | 1,300.7 |
Actual return on plan assets |  | 320.9 | 84.7 |
Company contributions |  | 51.3 | 51.1 |
Participant contributions |  | 0.0 | 0.0 |
Benefits paid |  | (57.8) | (53.8) |
Fair value of plan assets at plan year end |  | 1,055.3 | 1,382.7 | 1,300.7
Underfunded status |  | (111.8) | (121.1) |
Amounts Recognized on Consolidated Balance Sheets: |  |  |  |
Current liabilities |  | (1.9) | (1.9) |
Noncurrent liabilities |  | (109.9) | (119.2) |
Accrued obligation recognized at December 31 |  | (111.8) | (121.1) |
Amounts Recognized in Accumulated Other Comprehensive Loss (Income) (Pre-Tax): |  |  |  |
Prior service cost (credit) |  | 31.5 | 20.0 |
Actuarial loss (gain) |  | 155.6 | 130.4 |
Total |  | 187.1 | 150.4 |
Postretirement Plans |  |  |  |
Change in Benefit Obligations [Roll Forward] |  |  |  |
Benefit obligation at beginning of period |  | 13.6 | 13.1 |
Service cost |  | 0.2 | 0.2 | 0.3
Interest cost |  | 0.3 | 0.3 | 0.4
Plan amendments |  | 0.0 | (0.1) |
Actuarial (gain) loss | [1] | (3.4) | 1.3 |
Participant contributions |  | 0.5 | 0.6 |
Benefits paid |  | (1.7) | (1.8) |
Benefit obligation at plan year end |  | 9.5 | 13.6 | 13.1
Change in Fair Value of Plan Assets [Roll Forward] |  |  |  |
Plan assets at fair value at beginning of period |  | 0.0 | 0.0 |
Actual return on plan assets |  | 0.0 | 0.0 |
Company contributions |  | 1.2 | 1.2 |
Participant contributions |  | 0.5 | 0.6 |
Benefits paid |  | (1.7) | (1.8) |
Fair value of plan assets at plan year end |  | 0.0 | 0.0 | $ 0.0
Underfunded status |  | (9.5) | (13.6) |
Amounts Recognized on Consolidated Balance Sheets: |  |  |  |
Current liabilities |  | (0.5) | (0.6) |
Noncurrent liabilities |  | (9.0) | (13.0) |
Accrued obligation recognized at December 31 |  | (9.5) | (13.6) |
Amounts Recognized in Accumulated Other Comprehensive Loss (Income) (Pre-Tax): |  |  |  |
Prior service cost (credit) |  | (4.2) | (4.7) |
Actuarial loss (gain) |  | (6.7) | (3.6) |
Total |  | $ (10.9) | $ (8.3) |
[1] | For the year ended December 31, 2022, the most significant driver of the decrease in aggregate benefit obligations for the pension and OPEB plans was the actuarial gains due to an increase in the discount rate assumption. For the year ended December 31, 2021, the most significant driver of the decrease in benefit obligations for the pension plans was the actuarial gains due to an increase in the discount rate assumption. The OPEB plans experienced an actuarial loss primarily due to adverse medical claims experience that was partially offset by the effect of the change in the discount rate assumption.

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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, before tax, of accumulated other comprehensive income (loss) for gain (loss) of defined benefit plan, that has not been recognized in net periodic benefit (cost) credit. + 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 (j) -URI https://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI https://asc.fasb.org/extlink&oid=126968391&loc=SL7669686-108580 + Details
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- Definition Amount, before tax, of accumulated other comprehensive (income) loss for cost (credit) of benefit change attributable to participants' prior service from plan amendment or plan initiation of defined benefit plan, that has not been recognized in net periodic benefit cost (credit). + 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 (j) -URI https://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI https://asc.fasb.org/extlink&oid=126968391&loc=SL7669686-108580 + Details
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