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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, 2024
Dec. 31, 2023
Dec. 31, 2022
Pension Plan [Member]      
Net Periodic Benefit Cost      
Service cost $ 16.5 $ 15.5 $ 19.4
Interest cost 19.4 21.1 8.7
Expected return on assets (18.9) (19.0) (14.7)
Settlements 1.8 6.7 2.7
Net loss (1.5) (3.3) 1.8
Prior service cost 0.7 0.7 0.7
Net periodic benefit cost 18.0 21.7 18.6
Other Changes in Plan Assets and Benefit Obligation Recognized in Other Comprehensive Income/Loss      
Net (gain) loss (25.7) 31.9 (40.9)
Prior service credit 0.0 (1.2) (0.2)
Amortization of net loss (3.0) (3.7) (5.0)
Amortization of prior service credit (0.7) (0.7) (0.7)
Total recognized in other comprehensive income/loss (29.4) 26.3 (46.8)
Total recognized in net periodic benefit cost and other comprehensive income/loss (11.4) 48.0 (28.2)
Postretirement Health Coverage [Member]      
Net Periodic Benefit Cost      
Interest cost 0.5 0.5 0.3
Net loss 0.0 0.0 0.2
Prior service cost (0.8) (0.8) (0.8)
Net periodic benefit cost (0.3) (0.3) (0.3)
Other Changes in Plan Assets and Benefit Obligation Recognized in Other Comprehensive Income/Loss      
Net (gain) loss (1.1) (1.0) (2.0)
Amortization of net loss 0.0 0.0 (0.2)
Amortization of prior service credit 0.8 0.8 0.8
Total recognized in other comprehensive income/loss (0.3) (0.2) (1.4)
Total recognized in net periodic benefit cost and other comprehensive income/loss $ (0.6) $ (0.5) $ (1.7)