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Pension Plans - Fair Value of Plans' Assets (Details) - USD ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets $ 322.0 $ 367.5 $ 316.9
Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 322.0 367.5  
Equities and growth funds | Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 193.7 226.3  
Government bonds | Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 46.7 49.9  
Corporate bonds | Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 81.6 91.0  
Cash | Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0.0 0.3  
U.K.      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 283.4 326.3 280.3
U.K. | Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 283.4 326.3  
U.K. | Equities and growth funds | Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 173.1 203.4  
U.K. | Government bonds | Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 46.7 49.9  
U.K. | Corporate bonds | Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 63.6 72.7  
U.K. | Cash | Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0.0 0.3  
U.S./ other      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 38.6 41.2 $ 36.6
U.S./ other | Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 38.6 41.2  
U.S./ other | Equities and growth funds | Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 20.6 22.9  
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 18.0 18.3  
U.S./ other | Cash | Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets $ 0.0 $ 0.0