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Employee Retirement Benefits - Net Periodic Pension Expense (Details) - Pension Benefits - U.S. - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Defined Benefit Plan Disclosure [Line Items]        
Transfer of assets     $ (4.0)  
Interest cost $ 1.5 $ 1.5 3.0 $ 3.1
Expected return on plan assets (1.5) (2.0) (3.1) (4.0)
Net amortizations of actuarial net loss 0.5 0.4 0.9 0.9
Net periodic pension cost (benefit) $ 0.5 $ (0.1) $ 0.8 $ 0.0