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Benefit Plans - Fair Values of Pension Plan Assets by Asset Category (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Defined Benefit Plan, Funded (Unfunded) Status of Plan [Abstract]      
Fair value of plan assets $ 679.8 $ 310.2  
Total contribution to defined contribution plans 40.4 19.5 $ 15.9
Amount of actuarially calculated contribution 4.4 4.3  
Cash and cash equivalents      
Defined Benefit Plan, Funded (Unfunded) Status of Plan [Abstract]      
Fair value of plan assets 8.5 2.6  
Equity      
Defined Benefit Plan, Funded (Unfunded) Status of Plan [Abstract]      
Fair value of plan assets 201.1 129.7  
Equity | U.S. large-cap      
Defined Benefit Plan, Funded (Unfunded) Status of Plan [Abstract]      
Fair value of plan assets 55.4 5.3  
Equity | International equity      
Defined Benefit Plan, Funded (Unfunded) Status of Plan [Abstract]      
Fair value of plan assets 145.7 124.4  
Fixed income      
Defined Benefit Plan, Funded (Unfunded) Status of Plan [Abstract]      
Fair value of plan assets 391.7 115.8  
Fixed income | Corporate bonds - international      
Defined Benefit Plan, Funded (Unfunded) Status of Plan [Abstract]      
Fair value of plan assets 25.2 25.6  
Fixed income | UK index-linked gilts      
Defined Benefit Plan, Funded (Unfunded) Status of Plan [Abstract]      
Fair value of plan assets 41.5 29.1  
Fixed income | U.S. fixed income - government securities      
Defined Benefit Plan, Funded (Unfunded) Status of Plan [Abstract]      
Fair value of plan assets 103.6 3.9  
Fixed income | U.S. fixed income - short duration      
Defined Benefit Plan, Funded (Unfunded) Status of Plan [Abstract]      
Fair value of plan assets 19.7 4.6  
Fixed income | U.S. fixed income - intermediate duration      
Defined Benefit Plan, Funded (Unfunded) Status of Plan [Abstract]      
Fair value of plan assets 71.5 38.4  
Fixed income | U.S. fixed income - long corporate      
Defined Benefit Plan, Funded (Unfunded) Status of Plan [Abstract]      
Fair value of plan assets 130.2 14.2  
Other types of investments | International real estate      
Defined Benefit Plan, Funded (Unfunded) Status of Plan [Abstract]      
Fair value of plan assets 42.3 43.3  
Other types of investments | Other      
Defined Benefit Plan, Funded (Unfunded) Status of Plan [Abstract]      
Fair value of plan assets 36.2 18.8  
Investments Measured at NAV      
Defined Benefit Plan, Funded (Unfunded) Status of Plan [Abstract]      
Fair value of plan assets 194.7 121.0  
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 130.7 59.9  
Investments Measured at NAV | Equity | U.S. large-cap      
Defined Benefit Plan, Funded (Unfunded) Status of Plan [Abstract]      
Fair value of plan assets 49.0 0.0  
Investments Measured at NAV | Equity | International equity      
Defined Benefit Plan, Funded (Unfunded) Status of Plan [Abstract]      
Fair value of plan assets 81.7 59.9  
Investments Measured at NAV | Fixed income      
Defined Benefit Plan, Funded (Unfunded) Status of Plan [Abstract]      
Fair value of plan assets 64.0 61.1  
Investments Measured at NAV | Fixed income | Corporate bonds - international      
Defined Benefit Plan, Funded (Unfunded) Status of Plan [Abstract]      
Fair value of plan assets 0.0 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 4.7 3.9  
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 4.5 4.6  
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 45.2 38.4  
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 9.6 14.2  
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 0.0 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 32.7 25.6  
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 8.5 2.6  
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 24.2 23.0  
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 24.2 23.0  
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) | 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 0.0  
Significant Observable Inputs (Level 2)      
Defined Benefit Plan, Funded (Unfunded) Status of Plan [Abstract]      
Fair value of plan assets 416.2 144.8  
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 46.2 46.8  
Significant Observable Inputs (Level 2) | Equity | U.S. large-cap      
Defined Benefit Plan, Funded (Unfunded) Status of Plan [Abstract]      
Fair value of plan assets 6.4 5.3  
Significant Observable Inputs (Level 2) | Equity | International equity      
Defined Benefit Plan, Funded (Unfunded) Status of Plan [Abstract]      
Fair value of plan assets 39.8 41.5  
Significant Observable Inputs (Level 2) | Fixed income      
Defined Benefit Plan, Funded (Unfunded) Status of Plan [Abstract]      
Fair value of plan assets 327.7 54.7  
Significant Observable Inputs (Level 2) | Fixed income | Corporate bonds - international      
Defined Benefit Plan, Funded (Unfunded) Status of Plan [Abstract]      
Fair value of plan assets 25.2 25.6  
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 41.5 29.1  
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 98.9 0.0  
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 15.2 0.0  
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 26.3 0.0  
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 120.6 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 42.3 43.3  
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 36.2 18.8  
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. 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) | 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 $ 36.2 $ 18.8