XML 110 R96.htm IDEA: XBRL DOCUMENT v3.25.0.1
Benefit Plans - Fair Values of Pension Plan Assets by Asset Category (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Defined Benefit Plan, Funded (Unfunded) Status of Plan [Abstract]      
Fair value of plan assets $ 401.5 $ 443.5  
Total contribution to defined contribution plans 49.1 47.0 $ 46.6
Cash and cash equivalents      
Defined Benefit Plan, Funded (Unfunded) Status of Plan [Abstract]      
Fair value of plan assets 5.1 7.1  
Total equity funds      
Defined Benefit Plan, Funded (Unfunded) Status of Plan [Abstract]      
Fair value of plan assets 67.3 65.1  
U.S. small-cap      
Defined Benefit Plan, Funded (Unfunded) Status of Plan [Abstract]      
Fair value of plan assets 0.9 3.7  
U.S. mid-cap      
Defined Benefit Plan, Funded (Unfunded) Status of Plan [Abstract]      
Fair value of plan assets 2.6    
U.S. large-cap      
Defined Benefit Plan, Funded (Unfunded) Status of Plan [Abstract]      
Fair value of plan assets 14.1 19.5  
International equity      
Defined Benefit Plan, Funded (Unfunded) Status of Plan [Abstract]      
Fair value of plan assets 49.7 41.9  
Fixed income      
Defined Benefit Plan, Funded (Unfunded) Status of Plan [Abstract]      
Fair value of plan assets 277.6 326.3  
Corporate bonds - international      
Defined Benefit Plan, Funded (Unfunded) Status of Plan [Abstract]      
Fair value of plan assets 39.6 42.7  
UK index-linked gilts      
Defined Benefit Plan, Funded (Unfunded) Status of Plan [Abstract]      
Fair value of plan assets 66.0 78.7  
U.S. fixed income - government securities      
Defined Benefit Plan, Funded (Unfunded) Status of Plan [Abstract]      
Fair value of plan assets 20.5 43.2  
U.S. fixed income - short duration      
Defined Benefit Plan, Funded (Unfunded) Status of Plan [Abstract]      
Fair value of plan assets 1.8 1.3  
U.S. fixed income - intermediate duration      
Defined Benefit Plan, Funded (Unfunded) Status of Plan [Abstract]      
Fair value of plan assets 25.2 30.9  
U.S. fixed income - long duration      
Defined Benefit Plan, Funded (Unfunded) Status of Plan [Abstract]      
Fair value of plan assets 122.7 122.3  
Global fixed income      
Defined Benefit Plan, Funded (Unfunded) Status of Plan [Abstract]      
Fair value of plan assets 1.8 7.2  
International real estate      
Defined Benefit Plan, Funded (Unfunded) Status of Plan [Abstract]      
Fair value of plan assets 11.6 15.4  
Other      
Defined Benefit Plan, Funded (Unfunded) Status of Plan [Abstract]      
Fair value of plan assets 39.9 29.6  
Investments Measured at NAV      
Defined Benefit Plan, Funded (Unfunded) Status of Plan [Abstract]      
Fair value of plan assets 231.2 259.1  
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 | Total equity funds      
Defined Benefit Plan, Funded (Unfunded) Status of Plan [Abstract]      
Fair value of plan assets 41.6 38.4  
Investments Measured at NAV | U.S. small-cap      
Defined Benefit Plan, Funded (Unfunded) Status of Plan [Abstract]      
Fair value of plan assets 0.9 3.7  
Investments Measured at NAV | U.S. mid-cap      
Defined Benefit Plan, Funded (Unfunded) Status of Plan [Abstract]      
Fair value of plan assets 2.6    
Investments Measured at NAV | U.S. large-cap      
Defined Benefit Plan, Funded (Unfunded) Status of Plan [Abstract]      
Fair value of plan assets 11.6 17.5  
Investments Measured at NAV | International equity      
Defined Benefit Plan, Funded (Unfunded) Status of Plan [Abstract]      
Fair value of plan assets 26.5 17.2  
Investments Measured at NAV | Fixed income      
Defined Benefit Plan, Funded (Unfunded) Status of Plan [Abstract]      
Fair value of plan assets 187.8 220.7  
Investments Measured at NAV | Corporate bonds - international      
Defined Benefit Plan, Funded (Unfunded) Status of Plan [Abstract]      
Fair value of plan assets 15.8 15.8  
Investments Measured at NAV | 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 | U.S. fixed income - government securities      
Defined Benefit Plan, Funded (Unfunded) Status of Plan [Abstract]      
Fair value of plan assets 20.5 43.2  
Investments Measured at NAV | U.S. fixed income - short duration      
Defined Benefit Plan, Funded (Unfunded) Status of Plan [Abstract]      
Fair value of plan assets 1.8 1.3  
Investments Measured at NAV | U.S. fixed income - intermediate duration      
Defined Benefit Plan, Funded (Unfunded) Status of Plan [Abstract]      
Fair value of plan assets 25.2 30.9  
Investments Measured at NAV | U.S. fixed income - long duration      
Defined Benefit Plan, Funded (Unfunded) Status of Plan [Abstract]      
Fair value of plan assets 122.7 122.3  
Investments Measured at NAV | Global fixed income      
Defined Benefit Plan, Funded (Unfunded) Status of Plan [Abstract]      
Fair value of plan assets 1.8 7.2  
Investments Measured at NAV | 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      
Defined Benefit Plan, Funded (Unfunded) Status of Plan [Abstract]      
Fair value of plan assets 1.8 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 5.1 21.3  
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 5.1 7.1  
Quoted Prices in Active Markets for Identical Assets (Level 1) | Total equity funds      
Defined Benefit Plan, Funded (Unfunded) Status of Plan [Abstract]      
Fair value of plan assets 0.0 14.2  
Quoted Prices in Active Markets for Identical Assets (Level 1) | U.S. small-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) | U.S. mid-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) | 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) | International equity      
Defined Benefit Plan, Funded (Unfunded) Status of Plan [Abstract]      
Fair value of plan assets 0.0 14.2  
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) | 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) | 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) | 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) | 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) | 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) | U.S. fixed income - long 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) | Global 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) | 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      
Defined Benefit Plan, Funded (Unfunded) Status of Plan [Abstract]      
Fair value of plan assets  
Significant Observable Inputs (Level 2)      
Defined Benefit Plan, Funded (Unfunded) Status of Plan [Abstract]      
Fair value of plan assets 127.1 133.5  
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) | Total equity funds      
Defined Benefit Plan, Funded (Unfunded) Status of Plan [Abstract]      
Fair value of plan assets 25.7 12.5  
Significant Observable Inputs (Level 2) | U.S. small-cap      
Defined Benefit Plan, Funded (Unfunded) Status of Plan [Abstract]      
Fair value of plan assets 0.0 0.0  
Significant Observable Inputs (Level 2) | U.S. mid-cap      
Defined Benefit Plan, Funded (Unfunded) Status of Plan [Abstract]      
Fair value of plan assets 0.0    
Significant Observable Inputs (Level 2) | U.S. large-cap      
Defined Benefit Plan, Funded (Unfunded) Status of Plan [Abstract]      
Fair value of plan assets 2.5 2.0  
Significant Observable Inputs (Level 2) | International equity      
Defined Benefit Plan, Funded (Unfunded) Status of Plan [Abstract]      
Fair value of plan assets 23.2 10.5  
Significant Observable Inputs (Level 2) | Fixed income      
Defined Benefit Plan, Funded (Unfunded) Status of Plan [Abstract]      
Fair value of plan assets 89.8 105.6  
Significant Observable Inputs (Level 2) | Corporate bonds - international      
Defined Benefit Plan, Funded (Unfunded) Status of Plan [Abstract]      
Fair value of plan assets 23.8 26.9  
Significant Observable Inputs (Level 2) | UK index-linked gilts      
Defined Benefit Plan, Funded (Unfunded) Status of Plan [Abstract]      
Fair value of plan assets 66.0 78.7  
Significant Observable Inputs (Level 2) | 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 Observable Inputs (Level 2) | 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 Observable Inputs (Level 2) | 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 Observable Inputs (Level 2) | U.S. fixed income - long duration      
Defined Benefit Plan, Funded (Unfunded) Status of Plan [Abstract]      
Fair value of plan assets 0.0 0.0  
Significant Observable Inputs (Level 2) | Global fixed income      
Defined Benefit Plan, Funded (Unfunded) Status of Plan [Abstract]      
Fair value of plan assets 0.0 0.0  
Significant Observable Inputs (Level 2) | International real estate      
Defined Benefit Plan, Funded (Unfunded) Status of Plan [Abstract]      
Fair value of plan assets 11.6 15.4  
Significant Observable Inputs (Level 2) | 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 38.1 29.6  
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) | Total equity funds      
Defined Benefit Plan, Funded (Unfunded) Status of Plan [Abstract]      
Fair value of plan assets 0.0 0.0  
Significant Unobservable Inputs (Level 3) | U.S. small-cap      
Defined Benefit Plan, Funded (Unfunded) Status of Plan [Abstract]      
Fair value of plan assets 0.0 0.0  
Significant Unobservable Inputs (Level 3) | U.S. mid-cap      
Defined Benefit Plan, Funded (Unfunded) Status of Plan [Abstract]      
Fair value of plan assets 0.0    
Significant Unobservable Inputs (Level 3) | 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) | 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) | 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) | 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) | 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) | 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) | 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) | U.S. fixed income - long duration      
Defined Benefit Plan, Funded (Unfunded) Status of Plan [Abstract]      
Fair value of plan assets 0.0 0.0  
Significant Unobservable Inputs (Level 3) | Global 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) | 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      
Defined Benefit Plan, Funded (Unfunded) Status of Plan [Abstract]      
Fair value of plan assets $ 38.1 $ 29.6