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Interest and Other Expenses (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Other Nonoperating Income (Expense) [Abstract]      
Interest expense $ 38.2 $ 37.9 $ 36.0
Interest income (4.8) (3.6) (2.5)
Foreign exchange loss (gain) 0.8 2.8 (4.7)
Miscellaneous expense (income), net 16.7 12.4 (0.6)
Interest and other expenses $ 50.9 $ 49.5 $ 28.2