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Other Expense, net (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Significant components of Other Expense, net      
Other Expense, net $ 4.7 $ 4.0 $ 6.8
Investment income from life insurance policies      
Significant components of Other Expense, net      
Other Expense, net (66.4) (60.8) (55.3)
Interest expense on life insurance policy loans      
Significant components of Other Expense, net      
Other Expense, net 66.5 62.1 57.4
Life insurance policy cost of insurance      
Significant components of Other Expense, net      
Other Expense, net 11.5 10.9 10.1
Income from life insurance policy redemptions      
Significant components of Other Expense, net      
Other Expense, net (8.5) (4.4) (4.2)
Foreign currency transaction losses (gains)      
Significant components of Other Expense, net      
Other Expense, net 4.9 (1.8)  
Net periodic benefit cost - components other than service cost      
Significant components of Other Expense, net      
Other Expense, net 6.9 5.2 3.2
All other, net      
Significant components of Other Expense, net      
Other Expense, net $ (10.2) $ (7.2) $ (4.4)