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Pension Plans - Fair Value of Plans' Assets (Details) - USD ($)
$ in Millions
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets $ 371.1 $ 322.0 $ 367.5
Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 371.1 322.0  
Equities and growth funds | Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 173.0 193.7  
Government bonds | Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 52.7 46.7  
Corporate bonds | Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 145.3 81.6  
Cash | Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0.1 0.0  
U.K.      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 328.7 283.4 326.3
U.K. | Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 328.7 283.4  
U.K. | Equities and growth funds | Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 146.8 173.1  
U.K. | Government bonds | Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 52.7 46.7  
U.K. | Corporate bonds | Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 129.1 63.6  
U.K. | Cash | Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0.1 0.0  
U.S./ other      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 42.4 38.6 $ 41.2
U.S./ other | Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 42.4 38.6  
U.S./ other | Equities and growth funds | Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 26.2 20.6  
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 16.2 18.0  
U.S./ other | Cash | Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets $ 0.0 $ 0.0