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Retirement and Deferred Compensation Plans - Schedule of Components of Net Periodic Benefit Cost and Other Amounts Recognized in Other Comprehensive Loss (Income) (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Pension Plan [Member] |  |  |
Net Periodic Benefit Cost |  |  |
Service cost | $ 19.4 | $ 22.0 | $ 21.0
Interest cost | $ 8.7 | $ 6.1 | $ 9.4
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Interest Cost, Statement of Income or Comprehensive Income [Extensible Enumeration] | Other Comprehensive Income (Loss), Net of Tax | Other Comprehensive Income (Loss), Net of Tax | Other Comprehensive Income (Loss), Net of Tax
Expected return on assets | $ (14.7) | $ (12.2) | $ 13.5
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) Excluding Service Cost, Statement of Income or Comprehensive Income [Extensible Enumeration] | Other Comprehensive Income (Loss), Net of Tax | Other Comprehensive Income (Loss), Net of Tax | Other Comprehensive Income (Loss), Net of Tax
Settlements | $ 2.7 | $ 1.0 | $ 13.8
Defined Benefit Plan, Net Periodic Benefit (Cost) Credit, Settlement Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] | Other Comprehensive Income (Loss), Net of Tax | Other Comprehensive Income (Loss), Net of Tax | Other Comprehensive Income (Loss), Net of Tax
Net loss | $ 1.8 | $ 4.6 | $ 2.7
Defined Benefit Plan, Net Periodic Benefit (Cost) Credit, Amortization of Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] | Other Comprehensive Income (Loss), Net of Tax | Other Comprehensive Income (Loss), Net of Tax | Other Comprehensive Income (Loss), Net of Tax
Prior service cost | $ 0.7 | $ 0.7 | $ 0.7
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Amortization of Prior Service Cost (Credit), Statement of Income or Comprehensive Income [Extensible Enumeration] | Other Comprehensive Income (Loss), Net of Tax | Other Comprehensive Income (Loss), Net of Tax | Other Comprehensive Income (Loss), Net of Tax
Net periodic benefit cost | $ 18.6 | $ 22.2 | $ 34.1
Other Changes in Plan Assets and Benefit Obligation Recognized in Other Comprehensive Income/Loss |  |  |
Net (gain) loss | (40.9) | (60.0) | 44.1
Prior service cost | (0.2) | 0.0 | 0.4
Amortization of net loss | (5.0) | (5.6) | (6.3)
Amortization of prior service cost | (0.7) | (0.7) | (0.7)
Total recognized in other comprehensive income/loss | (46.8) | (66.3) | 37.5
Total recognized in net periodic benefit cost and other comprehensive income/loss | (28.2) | (44.1) | 71.6
Postretirement Health Coverage [Member] |  |  |
Net Periodic Benefit Cost |  |  |
Interest cost | 0.3 | 0.2 | 0.4
Net loss | 0.2 | 0.2 | 0.1
Prior service cost | (0.8) | (0.8) | (0.8)
Net periodic benefit cost | (0.3) | (0.4) | (0.3)
Other Changes in Plan Assets and Benefit Obligation Recognized in Other Comprehensive Income/Loss |  |  |
Net (gain) loss | (2.0) | 0.2 | 1.1
Amortization of net loss | (0.2) | (0.2) | (0.1)
Amortization of prior service cost | 0.8 | 0.8 | 0.8
Total recognized in other comprehensive income/loss | (1.4) | 0.8 | 1.8
Total recognized in net periodic benefit cost and other comprehensive income/loss | $ (1.7) | $ 0.4 | $ 1.5

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