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Employee Retirement Plans and Postretirement Benefits Pension Fair Value Hierarchy (Details) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Plan Assets, Amount $ 5,958.4 $ 5,542.1 $ 5,217.3
Fair Value Excluding NAV Per Share Practical Expedient [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Plan Assets, Amount 2,590.2 1,977.5  
Quoted prices in active markets (Level 1) | Fair Value Excluding NAV Per Share Practical Expedient [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Plan Assets, Amount (322.0) (792.0)  
Significant observable inputs (Level 2) | Fair Value Excluding NAV Per Share Practical Expedient [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Plan Assets, Amount 2,055.9 1,939.3  
Significant unobservable inputs (Level 3)      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Plan Assets, Amount 856.3 830.2 695.7
Significant unobservable inputs (Level 3) | Fair Value Excluding NAV Per Share Practical Expedient [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Plan Assets, Amount 856.3 830.2  
Cash      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Plan Assets, Amount 144.6 107.2  
Cash | Quoted prices in active markets (Level 1)      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Plan Assets, Amount 144.6 107.2  
Cash | Significant observable inputs (Level 2)      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Plan Assets, Amount 0.0 0.0  
Cash | Significant unobservable inputs (Level 3)      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Plan Assets, Amount 0.0 0.0  
Trades awaiting settlement      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Plan Assets, Amount 16.7 17.2  
Trades awaiting settlement | Quoted prices in active markets (Level 1)      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Plan Assets, Amount 16.7 17.2  
Trades awaiting settlement | Significant observable inputs (Level 2)      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Plan Assets, Amount 0.0 0.0  
Trades awaiting settlement | Significant unobservable inputs (Level 3)      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Plan Assets, Amount 0.0 0.0  
Bank deposits, short-term bills and notes      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Plan Assets, Amount 25.0 16.4  
Bank deposits, short-term bills and notes | Quoted prices in active markets (Level 1)      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Plan Assets, Amount 0.0 0.0  
Bank deposits, short-term bills and notes | Significant observable inputs (Level 2)      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Plan Assets, Amount 25.0 16.4  
Bank deposits, short-term bills and notes | Significant unobservable inputs (Level 3)      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Plan Assets, Amount 0.0 0.0  
Government securities      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Plan Assets, Amount 869.6 711.8  
Government securities | Quoted prices in active markets (Level 1)      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Plan Assets, Amount 0.0 0.0  
Government securities | Significant observable inputs (Level 2)      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Plan Assets, Amount 869.6 711.8  
Government securities | Significant unobservable inputs (Level 3)      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Plan Assets, Amount 0.0 0.0  
Corporate debt securities      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Plan Assets, Amount 112.7 272.3  
Corporate debt securities | Quoted prices in active markets (Level 1)      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Plan Assets, Amount 0.0 0.0  
Corporate debt securities | Significant observable inputs (Level 2)      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Plan Assets, Amount 112.7 272.3  
Corporate debt securities | Significant unobservable inputs (Level 3)      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Plan Assets, Amount 0.0 0.0  
Interest and inflation linked assets      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Plan Assets, Amount 1,059.6 948.1  
Interest and inflation linked assets | Quoted prices in active markets (Level 1)      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Plan Assets, Amount 0.0 0.0  
Interest and inflation linked assets | Significant observable inputs (Level 2)      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Plan Assets, Amount 1,048.6 938.8  
Interest and inflation linked assets | Significant unobservable inputs (Level 3)      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Plan Assets, Amount 11.0 9.3  
Annuities [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Plan Assets, Amount 783.9 748.1  
Annuities [Member] | Quoted prices in active markets (Level 1)      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Plan Assets, Amount 0.0 0.0  
Annuities [Member] | Significant observable inputs (Level 2)      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Plan Assets, Amount 0.0 0.0  
Annuities [Member] | Significant unobservable inputs (Level 3)      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Plan Assets, Amount 783.9 748.1  
Equity Option [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Plan Assets, Amount   6.3  
Equity Option [Member] | Quoted prices in active markets (Level 1)      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Plan Assets, Amount   6.3  
Equity Option [Member] | Significant observable inputs (Level 2)      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Plan Assets, Amount   0.0  
Equity Option [Member] | Significant unobservable inputs (Level 3)      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Plan Assets, Amount   0.0  
Debt funds | Fair Value Using NAV Per Share Practical Expedient [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Plan Assets, Amount 1,591.4 1,636.7  
Equity funds | Fair Value Using NAV Per Share Practical Expedient [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Plan Assets, Amount 1,418.6 1,820.5  
Real estate funds | Fair Value Using NAV Per Share Practical Expedient [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Plan Assets, Amount 274.4 20.4  
Hedge funds of funds | Fair Value Using NAV Per Share Practical Expedient [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Plan Assets, Amount 6.7    
Repurchase agreements      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Plan Assets, Amount (483.5) (923.2)  
Repurchase agreements | Quoted prices in active markets (Level 1)      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Plan Assets, Amount (483.5) (923.2)  
Repurchase agreements | Significant observable inputs (Level 2)      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Plan Assets, Amount 0.0 0.0  
Repurchase agreements | Significant unobservable inputs (Level 3)      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Plan Assets, Amount 0.0 0.0  
Private equity      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Plan Assets, Amount 61.4 72.8  
Private equity | Fair Value Using NAV Per Share Practical Expedient [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Plan Assets, Amount 77.1 87.0  
Private equity | Quoted prices in active markets (Level 1)      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Plan Assets, Amount 0.0 0.0  
Private equity | Significant observable inputs (Level 2)      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Plan Assets, Amount 0.0 0.0  
Private equity | Significant unobservable inputs (Level 3)      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Plan Assets, Amount 61.4 72.8  
Recoverable taxes      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Plan Assets, Amount 0.2 0.5  
Recoverable taxes | Quoted prices in active markets (Level 1)      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Plan Assets, Amount 0.2 0.5  
Recoverable taxes | Significant observable inputs (Level 2)      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Plan Assets, Amount 0.0 0.0  
Recoverable taxes | Significant unobservable inputs (Level 3)      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Plan Assets, Amount 0.0 0.0  
Pension Plan [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Plan Assets, Amount $ 5,958.4 $ 5,542.1 $ 5,217.3