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Pension Plans - Fair Value of Plans' Assets (Details) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets $ 403.9 $ 371.1 $ 322.0
Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 403.9 371.1  
Equities and growth funds | Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 179.2 173.0  
Government bonds | Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 63.1 52.7  
Corporate bonds | Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 159.7 145.3  
Cash | Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 1.9 0.1  
U.K.      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 358.9 328.7 283.4
U.K. | Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 358.9 328.7  
U.K. | Equities and growth funds | Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 152.3 146.8  
U.K. | Government bonds | Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 63.1 52.7  
U.K. | Corporate bonds | Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 141.6 129.1  
U.K. | Cash | Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 1.9 0.1  
U.S./ other      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 45.0 42.4 $ 38.6
U.S./ other | Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 45.0 42.4  
U.S./ other | Equities and growth funds | Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 26.9 26.2  
U.S./ other | Government bonds | Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0.0 0.0  
U.S./ other | Corporate bonds | Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 18.1 16.2  
U.S./ other | Cash | Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets $ 0.0 $ 0.0