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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
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