Financing Receivable - Factoring Facility and Financing Receivable (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Financing Receivable
Balance, beginning of period	$ 28.4	$ 32.7
Sales of trade accounts receivable	385.9	354.9
Proceeds from sales of trade accounts receivable	(389.5)	(349.2)
Advances, net against financing receivable	(12.4)	(8.5)
Currency translation adjustments	4.1	(1.5)
Balance, end of period	$ 16.5	$ 28.4