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Interest and Other Expenses (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Other Nonoperating Income (Expense) [Abstract]    
Interest expense $ 13.6 $ 11.9
Interest income (1.2) (1.0)
Foreign exchange (gain) loss (0.1) 0.1
Miscellaneous expenses, net 3.8 4.8
Interest and other expenses $ 16.1 $ 15.8