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Other–Net, (Income) Expense (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Nonoperating Income (Expense) [Abstract]    
Interest expense $ 86.5 $ 61.2
Interest income (30.6) (45.5)
Retirement benefit (55.9) (56.0)
Other income (86.0) (29.2)
Other–net, (income) expense $ (86.0) $ (69.5)