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Retirement Benefits - Schedule of Significant Changes in Level 3 Plan Assets (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Fair value of plan assets, beginning of year $ 43.6 $ 39.7  
Payments (1.4) (1.5)  
Actuarial (gain) loss 3.7 0.2 $ (0.2)
Interest income 4.9 2.4  
Cumulative translation adjustments 3.2 1.0  
Fair value of plan assets, end of year 52.3 43.6 39.7
Level 3      
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Fair value of plan assets, beginning of year 4.7    
Fair value of plan assets, end of year 4.4 4.7  
Insurance contracts      
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Fair value of plan assets, beginning of year 4.7    
Fair value of plan assets, end of year 4.4 4.7  
Insurance contracts | Level 3      
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Fair value of plan assets, beginning of year 4.7 4.9  
Payments (0.5) (0.5)  
Actuarial (gain) loss (0.3) 0.0  
Interest income 0.2 0.2  
Cumulative translation adjustments 0.3 0.1  
Fair value of plan assets, end of year $ 4.4 $ 4.7 $ 4.9