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Interest and Other Expenses (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Other Nonoperating Income (Expense) [Abstract]        
Interest expense $ 13.3 $ 11.9 $ 26.9 $ 23.8
Interest income (1.4) (1.2) (2.6) (2.2)
Foreign exchange (gain) loss (0.1) 0.2 (0.2) 0.3
Miscellaneous (income) expense, net (1.3) 0.1 2.5 4.9
Interest and other expenses $ 10.5 $ 11.0 $ 26.6 $ 26.8