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Employee Retirement Plans and Postretirement Benefits - Pension Fair Value Hierarchy (Details) - USD ($)
$ in Millions
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan assets $ 3,336.8 $ 5,667.5 $ 5,958.4
Pension      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan assets 3,336.8 5,667.5 5,958.4
Fair Value, Inputs, Level 1, 2 and 3 | Pension      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan assets 1,264.6 2,410.1  
Quoted prices in active markets (Level 1) | Pension      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan assets (149.1) (276.7)  
Significant observable inputs (Level 2) | Pension      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan assets 926.7 1,932.3  
Significant unobservable inputs (Level 3)      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan assets 487.0 754.5 $ 856.3
Significant unobservable inputs (Level 3) | Pension      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan assets 487.0 754.5  
Cash | Fair Value, Inputs, Level 1, 2 and 3 | Pension      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan assets 99.3 198.4  
Cash | Quoted prices in active markets (Level 1) | Pension      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan assets 99.3 198.4  
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  
Trades awaiting settlement | Fair Value, Inputs, Level 1, 2 and 3 | Pension      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan assets 32.7 2.1  
Trades awaiting settlement | Quoted prices in active markets (Level 1) | Pension      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan assets 32.7 2.1  
Trades awaiting settlement | Significant observable inputs (Level 2) | Pension      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan assets 0.0 0.0  
Trades awaiting settlement | 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 7.0 25.5  
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 7.0 25.5  
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 422.6 751.0  
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 422.6 751.0  
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 89.1 142.0  
Corporate debt securities | Quoted prices in active markets (Level 1) | Pension      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan assets 0.0 0.0  
Corporate debt securities | Significant observable inputs (Level 2) | Pension      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan assets 89.1 142.0  
Corporate debt securities | Significant unobservable inputs (Level 3) | Pension      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan assets 0.0 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 420.6 1,029.7  
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 408.0 1,013.8  
Interest and inflation linked assets | Significant unobservable inputs (Level 3) | Pension      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan assets 12.6 15.9  
Annuities and longevity swap | Fair Value, Inputs, Level 1, 2 and 3 | Pension      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan assets 461.8 708.9  
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 461.8 708.9  
Repurchase agreements | Fair Value, Inputs, Level 1, 2 and 3 | Pension      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan assets (281.2) (477.4)  
Repurchase agreements | Quoted prices in active markets (Level 1) | Pension      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan assets (281.2) (477.4)  
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 12.4 29.7  
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 12.4 29.7  
Private equity | Fair Value Measured at Net Asset Value Per Share | Pension      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan assets 44.7 65.8  
Debt funds | Fair Value Measured at Net Asset Value Per Share | Pension      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan assets 1,355.7 2,034.2  
Equity funds | Fair Value Measured at Net Asset Value Per Share | Pension      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan assets 417.4 732.1  
Real estate funds | Fair Value Measured at Net Asset Value Per Share | Pension      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan assets 130.9 285.0  
Hedge funds | Fair Value Measured at Net Asset Value Per Share | Pension      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan assets 123.5 $ 140.3  
Collateralized Securities | Fair Value, Inputs, Level 1, 2 and 3 | Pension      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan assets 0.2    
Collateralized Securities | Quoted prices in active markets (Level 1) | Pension      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan assets 0.0    
Collateralized Securities | Significant observable inputs (Level 2) | Pension      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan assets 0.0    
Collateralized Securities | Significant unobservable inputs (Level 3) | Pension      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan assets $ 0.2