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Benefit Plans - Fair Values of Pension Plan Assets by Asset Category (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Defined Benefit Plan, Funded (Unfunded) Status of Plan [Abstract]      
Fair value of plan assets $ 682.4 $ 679.8  
Total contribution to defined contribution plans 40.6 35.9 $ 19.5
Amount of actuarially calculated contribution 4.9 4.4  
Cash and cash equivalents      
Defined Benefit Plan, Funded (Unfunded) Status of Plan [Abstract]      
Fair value of plan assets 12.7 8.5  
Equity      
Defined Benefit Plan, Funded (Unfunded) Status of Plan [Abstract]      
Fair value of plan assets 181.8 201.1  
Equity | U.S. small-cap      
Defined Benefit Plan, Funded (Unfunded) Status of Plan [Abstract]      
Fair value of plan assets 6.3    
Equity | U.S. large-cap      
Defined Benefit Plan, Funded (Unfunded) Status of Plan [Abstract]      
Fair value of plan assets 37.0 55.4  
Equity | International equity      
Defined Benefit Plan, Funded (Unfunded) Status of Plan [Abstract]      
Fair value of plan assets 138.5 145.7  
Fixed income      
Defined Benefit Plan, Funded (Unfunded) Status of Plan [Abstract]      
Fair value of plan assets 403.4 391.7  
Fixed income | Corporate bonds - international      
Defined Benefit Plan, Funded (Unfunded) Status of Plan [Abstract]      
Fair value of plan assets 34.9 25.2  
Fixed income | UK index-linked gilts      
Defined Benefit Plan, Funded (Unfunded) Status of Plan [Abstract]      
Fair value of plan assets 35.9 41.5  
Fixed income | U.S. fixed income - government securities      
Defined Benefit Plan, Funded (Unfunded) Status of Plan [Abstract]      
Fair value of plan assets 38.0 103.6  
Fixed income | U.S. fixed income - short duration      
Defined Benefit Plan, Funded (Unfunded) Status of Plan [Abstract]      
Fair value of plan assets 5.2 19.7  
Fixed income | U.S. fixed income - intermediate duration      
Defined Benefit Plan, Funded (Unfunded) Status of Plan [Abstract]      
Fair value of plan assets 41.1 71.5  
Fixed income | U.S. fixed income - long corporate      
Defined Benefit Plan, Funded (Unfunded) Status of Plan [Abstract]      
Fair value of plan assets 234.8 130.2  
Fixed income | Global fixed income      
Defined Benefit Plan, Funded (Unfunded) Status of Plan [Abstract]      
Fair value of plan assets 13.5    
Other types of investments | International real estate      
Defined Benefit Plan, Funded (Unfunded) Status of Plan [Abstract]      
Fair value of plan assets 49.5 42.3  
Other types of investments | Other      
Defined Benefit Plan, Funded (Unfunded) Status of Plan [Abstract]      
Fair value of plan assets 35.0 36.2  
Investments Measured at NAV      
Defined Benefit Plan, Funded (Unfunded) Status of Plan [Abstract]      
Fair value of plan assets 446.8 194.7  
Investments Measured at NAV | Cash and cash equivalents      
Defined Benefit Plan, Funded (Unfunded) Status of Plan [Abstract]      
Fair value of plan assets 0.0 0.0  
Investments Measured at NAV | Equity      
Defined Benefit Plan, Funded (Unfunded) Status of Plan [Abstract]      
Fair value of plan assets 103.6 130.7  
Investments Measured at NAV | Equity | U.S. small-cap      
Defined Benefit Plan, Funded (Unfunded) Status of Plan [Abstract]      
Fair value of plan assets 6.3    
Investments Measured at NAV | Equity | U.S. large-cap      
Defined Benefit Plan, Funded (Unfunded) Status of Plan [Abstract]      
Fair value of plan assets 29.0 49.0  
Investments Measured at NAV | Equity | International equity      
Defined Benefit Plan, Funded (Unfunded) Status of Plan [Abstract]      
Fair value of plan assets 68.3 81.7  
Investments Measured at NAV | Fixed income      
Defined Benefit Plan, Funded (Unfunded) Status of Plan [Abstract]      
Fair value of plan assets 342.2 64.0  
Investments Measured at NAV | Fixed income | Corporate bonds - international      
Defined Benefit Plan, Funded (Unfunded) Status of Plan [Abstract]      
Fair value of plan assets 9.6 0.0  
Investments Measured at NAV | Fixed income | UK index-linked gilts      
Defined Benefit Plan, Funded (Unfunded) Status of Plan [Abstract]      
Fair value of plan assets 0.0 0.0  
Investments Measured at NAV | Fixed income | U.S. fixed income - government securities      
Defined Benefit Plan, Funded (Unfunded) Status of Plan [Abstract]      
Fair value of plan assets 38.0 4.7  
Investments Measured at NAV | Fixed income | U.S. fixed income - short duration      
Defined Benefit Plan, Funded (Unfunded) Status of Plan [Abstract]      
Fair value of plan assets 5.2 4.5  
Investments Measured at NAV | Fixed income | U.S. fixed income - intermediate duration      
Defined Benefit Plan, Funded (Unfunded) Status of Plan [Abstract]      
Fair value of plan assets 41.1 45.2  
Investments Measured at NAV | Fixed income | U.S. fixed income - long corporate      
Defined Benefit Plan, Funded (Unfunded) Status of Plan [Abstract]      
Fair value of plan assets 234.8 9.6  
Investments Measured at NAV | Fixed income | Global fixed income      
Defined Benefit Plan, Funded (Unfunded) Status of Plan [Abstract]      
Fair value of plan assets 13.5    
Investments Measured at NAV | Other types of investments | International real estate      
Defined Benefit Plan, Funded (Unfunded) Status of Plan [Abstract]      
Fair value of plan assets 0.0 0.0  
Investments Measured at NAV | Other types of investments | Other      
Defined Benefit Plan, Funded (Unfunded) Status of Plan [Abstract]      
Fair value of plan assets 1.0 0.0  
Quoted Prices in Active Markets for Identical Assets (Level 1)      
Defined Benefit Plan, Funded (Unfunded) Status of Plan [Abstract]      
Fair value of plan assets 37.0 32.7  
Quoted Prices in Active Markets for Identical Assets (Level 1) | Cash and cash equivalents      
Defined Benefit Plan, Funded (Unfunded) Status of Plan [Abstract]      
Fair value of plan assets 12.7 8.5  
Quoted Prices in Active Markets for Identical Assets (Level 1) | Equity      
Defined Benefit Plan, Funded (Unfunded) Status of Plan [Abstract]      
Fair value of plan assets 24.3 24.2  
Quoted Prices in Active Markets for Identical Assets (Level 1) | Equity | U.S. small-cap      
Defined Benefit Plan, Funded (Unfunded) Status of Plan [Abstract]      
Fair value of plan assets 0.0    
Quoted Prices in Active Markets for Identical Assets (Level 1) | Equity | U.S. large-cap      
Defined Benefit Plan, Funded (Unfunded) Status of Plan [Abstract]      
Fair value of plan assets 0.0 0.0  
Quoted Prices in Active Markets for Identical Assets (Level 1) | Equity | International equity      
Defined Benefit Plan, Funded (Unfunded) Status of Plan [Abstract]      
Fair value of plan assets 24.3 24.2  
Quoted Prices in Active Markets for Identical Assets (Level 1) | Fixed income      
Defined Benefit Plan, Funded (Unfunded) Status of Plan [Abstract]      
Fair value of plan assets 0.0 0.0  
Quoted Prices in Active Markets for Identical Assets (Level 1) | Fixed income | Corporate bonds - international      
Defined Benefit Plan, Funded (Unfunded) Status of Plan [Abstract]      
Fair value of plan assets 0.0 0.0  
Quoted Prices in Active Markets for Identical Assets (Level 1) | Fixed income | UK index-linked gilts      
Defined Benefit Plan, Funded (Unfunded) Status of Plan [Abstract]      
Fair value of plan assets 0.0 0.0  
Quoted Prices in Active Markets for Identical Assets (Level 1) | Fixed income | U.S. fixed income - government securities      
Defined Benefit Plan, Funded (Unfunded) Status of Plan [Abstract]      
Fair value of plan assets 0.0 0.0  
Quoted Prices in Active Markets for Identical Assets (Level 1) | Fixed income | U.S. fixed income - short duration      
Defined Benefit Plan, Funded (Unfunded) Status of Plan [Abstract]      
Fair value of plan assets 0.0 0.0  
Quoted Prices in Active Markets for Identical Assets (Level 1) | Fixed income | U.S. fixed income - intermediate duration      
Defined Benefit Plan, Funded (Unfunded) Status of Plan [Abstract]      
Fair value of plan assets 0.0 0.0  
Quoted Prices in Active Markets for Identical Assets (Level 1) | Fixed income | U.S. fixed income - long corporate      
Defined Benefit Plan, Funded (Unfunded) Status of Plan [Abstract]      
Fair value of plan assets 0.0 0.0  
Quoted Prices in Active Markets for Identical Assets (Level 1) | Fixed income | Global fixed income      
Defined Benefit Plan, Funded (Unfunded) Status of Plan [Abstract]      
Fair value of plan assets 0.0    
Quoted Prices in Active Markets for Identical Assets (Level 1) | Other types of investments | International real estate      
Defined Benefit Plan, Funded (Unfunded) Status of Plan [Abstract]      
Fair value of plan assets 0.0 0.0  
Quoted Prices in Active Markets for Identical Assets (Level 1) | Other types of investments | Other      
Defined Benefit Plan, Funded (Unfunded) Status of Plan [Abstract]      
Fair value of plan assets 0.0  
Significant Observable Inputs (Level 2)      
Defined Benefit Plan, Funded (Unfunded) Status of Plan [Abstract]      
Fair value of plan assets 164.6 416.2  
Significant Observable Inputs (Level 2) | Cash and cash equivalents      
Defined Benefit Plan, Funded (Unfunded) Status of Plan [Abstract]      
Fair value of plan assets 0.0 0.0  
Significant Observable Inputs (Level 2) | Equity      
Defined Benefit Plan, Funded (Unfunded) Status of Plan [Abstract]      
Fair value of plan assets 53.9 46.2  
Significant Observable Inputs (Level 2) | Equity | U.S. small-cap      
Defined Benefit Plan, Funded (Unfunded) Status of Plan [Abstract]      
Fair value of plan assets 0.0    
Significant Observable Inputs (Level 2) | Equity | U.S. large-cap      
Defined Benefit Plan, Funded (Unfunded) Status of Plan [Abstract]      
Fair value of plan assets 8.0 6.4  
Significant Observable Inputs (Level 2) | Equity | International equity      
Defined Benefit Plan, Funded (Unfunded) Status of Plan [Abstract]      
Fair value of plan assets 45.9 39.8  
Significant Observable Inputs (Level 2) | Fixed income      
Defined Benefit Plan, Funded (Unfunded) Status of Plan [Abstract]      
Fair value of plan assets 61.2 327.7  
Significant Observable Inputs (Level 2) | Fixed income | Corporate bonds - international      
Defined Benefit Plan, Funded (Unfunded) Status of Plan [Abstract]      
Fair value of plan assets 25.3 25.2  
Significant Observable Inputs (Level 2) | Fixed income | UK index-linked gilts      
Defined Benefit Plan, Funded (Unfunded) Status of Plan [Abstract]      
Fair value of plan assets 35.9 41.5  
Significant Observable Inputs (Level 2) | Fixed income | U.S. fixed income - government securities      
Defined Benefit Plan, Funded (Unfunded) Status of Plan [Abstract]      
Fair value of plan assets 0.0 98.9  
Significant Observable Inputs (Level 2) | Fixed income | U.S. fixed income - short duration      
Defined Benefit Plan, Funded (Unfunded) Status of Plan [Abstract]      
Fair value of plan assets 0.0 15.2  
Significant Observable Inputs (Level 2) | Fixed income | U.S. fixed income - intermediate duration      
Defined Benefit Plan, Funded (Unfunded) Status of Plan [Abstract]      
Fair value of plan assets 0.0 26.3  
Significant Observable Inputs (Level 2) | Fixed income | U.S. fixed income - long corporate      
Defined Benefit Plan, Funded (Unfunded) Status of Plan [Abstract]      
Fair value of plan assets 0.0 120.6  
Significant Observable Inputs (Level 2) | Fixed income | Global fixed income      
Defined Benefit Plan, Funded (Unfunded) Status of Plan [Abstract]      
Fair value of plan assets 0.0    
Significant Observable Inputs (Level 2) | Other types of investments | International real estate      
Defined Benefit Plan, Funded (Unfunded) Status of Plan [Abstract]      
Fair value of plan assets 49.5 42.3  
Significant Observable Inputs (Level 2) | Other types of investments | Other      
Defined Benefit Plan, Funded (Unfunded) Status of Plan [Abstract]      
Fair value of plan assets 0.0 0.0  
Significant Unobservable Inputs (Level 3)      
Defined Benefit Plan, Funded (Unfunded) Status of Plan [Abstract]      
Fair value of plan assets 34.0 36.2  
Significant Unobservable Inputs (Level 3) | Cash and cash equivalents      
Defined Benefit Plan, Funded (Unfunded) Status of Plan [Abstract]      
Fair value of plan assets 0.0 0.0  
Significant Unobservable Inputs (Level 3) | Equity      
Defined Benefit Plan, Funded (Unfunded) Status of Plan [Abstract]      
Fair value of plan assets 0.0 0.0  
Significant Unobservable Inputs (Level 3) | Equity | U.S. small-cap      
Defined Benefit Plan, Funded (Unfunded) Status of Plan [Abstract]      
Fair value of plan assets 0.0    
Significant Unobservable Inputs (Level 3) | Equity | U.S. large-cap      
Defined Benefit Plan, Funded (Unfunded) Status of Plan [Abstract]      
Fair value of plan assets 0.0 0.0  
Significant Unobservable Inputs (Level 3) | Equity | International equity      
Defined Benefit Plan, Funded (Unfunded) Status of Plan [Abstract]      
Fair value of plan assets 0.0 0.0  
Significant Unobservable Inputs (Level 3) | Fixed income      
Defined Benefit Plan, Funded (Unfunded) Status of Plan [Abstract]      
Fair value of plan assets 0.0 0.0  
Significant Unobservable Inputs (Level 3) | Fixed income | Corporate bonds - international      
Defined Benefit Plan, Funded (Unfunded) Status of Plan [Abstract]      
Fair value of plan assets 0.0 0.0  
Significant Unobservable Inputs (Level 3) | Fixed income | UK index-linked gilts      
Defined Benefit Plan, Funded (Unfunded) Status of Plan [Abstract]      
Fair value of plan assets 0.0 0.0  
Significant Unobservable Inputs (Level 3) | Fixed income | U.S. fixed income - government securities      
Defined Benefit Plan, Funded (Unfunded) Status of Plan [Abstract]      
Fair value of plan assets 0.0 0.0  
Significant Unobservable Inputs (Level 3) | Fixed income | U.S. fixed income - short duration      
Defined Benefit Plan, Funded (Unfunded) Status of Plan [Abstract]      
Fair value of plan assets 0.0 0.0  
Significant Unobservable Inputs (Level 3) | Fixed income | U.S. fixed income - intermediate duration      
Defined Benefit Plan, Funded (Unfunded) Status of Plan [Abstract]      
Fair value of plan assets 0.0 0.0  
Significant Unobservable Inputs (Level 3) | Fixed income | U.S. fixed income - long corporate      
Defined Benefit Plan, Funded (Unfunded) Status of Plan [Abstract]      
Fair value of plan assets 0.0 0.0  
Significant Unobservable Inputs (Level 3) | Fixed income | Global fixed income      
Defined Benefit Plan, Funded (Unfunded) Status of Plan [Abstract]      
Fair value of plan assets 0.0    
Significant Unobservable Inputs (Level 3) | Other types of investments | International real estate      
Defined Benefit Plan, Funded (Unfunded) Status of Plan [Abstract]      
Fair value of plan assets 0.0 0.0  
Significant Unobservable Inputs (Level 3) | Other types of investments | Other      
Defined Benefit Plan, Funded (Unfunded) Status of Plan [Abstract]      
Fair value of plan assets $ 34.0 $ 36.2