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Employee Retirement Plans and Postretirement Benefits - Pension Fair Value Hierarchy (Details) - USD ($)
$ in Millions
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan assets $ 2,727.4 $ 3,396.9 $ 3,336.8
Pension      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan assets 2,727.4 3,396.9 3,336.8
Fair Value, Inputs, Level 1, 2 and 3 | Pension      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan assets 923.9 1,442.5  
Quoted prices in active markets (Level 1) | Pension      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan assets (201.5) (246.1)  
Significant observable inputs (Level 2) | Pension      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan assets 733.8 1,214.0  
Significant unobservable inputs (Level 3)      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan assets 391.6 474.6 $ 487.0
Significant unobservable inputs (Level 3) | Pension      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan assets 391.6 474.6  
Cash | Fair Value, Inputs, Level 1, 2 and 3 | Pension      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan assets 42.6 39.5  
Cash | Quoted prices in active markets (Level 1) | Pension      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan assets 42.6 39.5  
Cash | Significant observable inputs (Level 2) | Pension      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan assets 0.0 0.0  
Cash | Significant unobservable inputs (Level 3) | Pension      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan assets 0.0 0.0  
Bank deposits, short-term bills and notes | Fair Value, Inputs, Level 1, 2 and 3 | Pension      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan assets 40.5 26.4  
Bank deposits, short-term bills and notes | Quoted prices in active markets (Level 1) | Pension      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan assets 0.0 0.0  
Bank deposits, short-term bills and notes | Significant observable inputs (Level 2) | Pension      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan assets 40.5 26.4  
Bank deposits, short-term bills and notes | Significant unobservable inputs (Level 3) | Pension      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan assets 0.0 0.0  
Government debt securities | Fair Value, Inputs, Level 1, 2 and 3 | Pension      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan assets 290.6 452.3  
Government debt securities | Quoted prices in active markets (Level 1) | Pension      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan assets 0.0 0.0  
Government debt securities | Significant observable inputs (Level 2) | Pension      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan assets 290.6 452.3  
Government debt securities | Significant unobservable inputs (Level 3) | Pension      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan assets 0.0 0.0  
Corporate debt securities | Fair Value, Inputs, Level 1, 2 and 3 | Pension      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan assets   119.3  
Corporate debt securities | Quoted prices in active markets (Level 1) | Pension      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan assets   0.0  
Corporate debt securities | Significant observable inputs (Level 2) | Pension      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan assets   119.3  
Corporate debt securities | Significant unobservable inputs (Level 3) | Pension      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan assets   0.0  
Interest and inflation linked assets | Fair Value, Inputs, Level 1, 2 and 3 | Pension      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan assets 415.0 629.9  
Interest and inflation linked assets | Quoted prices in active markets (Level 1) | Pension      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan assets 0.0 0.0  
Interest and inflation linked assets | Significant observable inputs (Level 2) | Pension      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan assets 402.7 616.0  
Interest and inflation linked assets | Significant unobservable inputs (Level 3) | Pension      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan assets 12.3 13.9  
Collateralized debt securities | Fair Value, Inputs, Level 1, 2 and 3 | Pension      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan assets   0.3  
Collateralized debt securities | Quoted prices in active markets (Level 1) | Pension      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan assets   0.0  
Collateralized debt securities | Significant observable inputs (Level 2) | Pension      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan assets   0.0  
Collateralized debt securities | Significant unobservable inputs (Level 3) | Pension      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan assets   0.3  
Annuities and longevity swap | Fair Value, Inputs, Level 1, 2 and 3 | Pension      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan assets 373.6 449.8  
Annuities and longevity swap | Quoted prices in active markets (Level 1) | Pension      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan assets 0.0 0.0  
Annuities and longevity swap | Significant observable inputs (Level 2) | Pension      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan assets 0.0 0.0  
Annuities and longevity swap | Significant unobservable inputs (Level 3) | Pension      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan assets 373.6 449.8  
Repurchase agreements | Fair Value, Inputs, Level 1, 2 and 3 | Pension      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan assets (244.2) (285.8)  
Repurchase agreements | Quoted prices in active markets (Level 1) | Pension      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan assets (244.2) (285.8)  
Repurchase agreements | Significant observable inputs (Level 2) | Pension      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan assets 0.0 0.0  
Repurchase agreements | Significant unobservable inputs (Level 3) | Pension      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan assets 0.0 0.0  
Recoverable taxes | Fair Value, Inputs, Level 1, 2 and 3 | Pension      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan assets 0.1 0.2  
Recoverable taxes | Quoted prices in active markets (Level 1) | Pension      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan assets 0.1 0.2  
Recoverable taxes | Significant observable inputs (Level 2) | Pension      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan assets 0.0 0.0  
Recoverable taxes | Significant unobservable inputs (Level 3) | Pension      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan assets 0.0 0.0  
Private equity | Fair Value, Inputs, Level 1, 2 and 3 | Pension      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan assets 5.7 10.6  
Private equity | Quoted prices in active markets (Level 1) | Pension      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan assets 0.0 0.0  
Private equity | Significant observable inputs (Level 2) | Pension      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan assets 0.0 0.0  
Private equity | Significant unobservable inputs (Level 3) | Pension      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan assets 5.7 10.6  
Private equity | Fair Value Measured at Net Asset Value Per Share | Pension      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan assets 28.8 37.8  
Debt funds | Fair Value Measured at Net Asset Value Per Share | Pension      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan assets 1,266.2 1,263.9  
Equity funds | Fair Value Measured at Net Asset Value Per Share | Pension      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan assets 175.7 260.7  
Real estate funds | Fair Value Measured at Net Asset Value Per Share | Pension      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan assets 82.3 126.3  
Hedge funds | Fair Value Measured at Net Asset Value Per Share | Pension      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan assets $ 250.5 $ 265.7