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Benefit Plans, Changes in Plan Assets and Benefit Obligations Recognized in Other Comprehensive Income (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Change in Plan Assets and Benefit Obligations Recognized in Other Comprehensive Income [Abstract] |  |  |
Total recognized in other comprehensive income | $ (5.6) | $ (35.3) | $ (45.2)
Pension Benefits [Member] |  |  |
Change in Plan Assets and Benefit Obligations Recognized in Other Comprehensive Income [Abstract] |  |  |
Current year actuarial gain (loss) | 3.8 | 31.2 |
Amortization of actuarial (gain) loss | 2.2 | 4.0 |
Total recognized in other comprehensive income | 6.0 | 35.2 |
Post-Retirement Benefits [Member] |  |  |
Change in Plan Assets and Benefit Obligations Recognized in Other Comprehensive Income [Abstract] |  |  |
Current year actuarial gain (loss) | (0.1) | 0.4 |
Amortization of actuarial (gain) loss | (0.3) | (0.3) |
Total recognized in other comprehensive income | $ (0.4) | $ 0.1 |

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- Definition Amount, after tax, of gain (loss) for (increase) decrease in value of benefit obligation for change in actuarial assumptions and increase (decrease) in value of plan assets from experience different from that assumed of defined benefit plan, that has not been recognized in net periodic benefit (cost) credit. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 220 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 11 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482790/220-10-45-11 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (i) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480506/715-20-50-1 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 45 -Paragraph 10A -Subparagraph (i) -SubTopic 10 -Topic 220 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482790/220-10-45-10A + Details
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