Other Income and Expense (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Other income and expense [Line Items]
Other income (expense), net	$ (0.1)	$ (29.7)	$ 0.9
Bridge loan commitment fees
Other income and expense [Line Items]
Other income (expense), net	0.0	(63.4)	(6.9)
Gain on sale of non-operating asset
Other income and expense [Line Items]
Other income (expense), net	0.0	20.5	0.8
Gain (loss) from other foreign exchange and derivative activity, net
Other income and expense [Line Items]
Other income (expense), net	(9.5)	10.0	6.2
Other income (expense), net
Other income and expense [Line Items]
Other income (expense), net	$ 9.4	$ 3.2	$ 0.8