Accounts Receivable - Allowance (Details) - Allowance for doubtful accounts - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Summary of activity in the Company's allowance for doubtful accounts
Balance at Beginning of Period	$ 9.1	$ 10.1	$ 7.9
Additions Charged to Expense	0.9	2.1	5.5
Deductions Amounts Written Off	(2.0)	(2.5)	(2.5)
Foreign Currency Impact	(0.1)	(0.6)	(0.8)
Balance at End of Period	$ 7.9	$ 9.1	$ 10.1