Debt - Debt Issuance Costs (Details) - USD ($) $ in Millions	Dec. 31, 2016	Dec. 31, 2015
Recent Accounting Pronouncements
Current portion of long-term debt and long-term debt	$ 411.7	$ 265.8
Accounting Standards Update ("ASU") 2015-03 - Simplifying the Presentation of Debt Issuance Costs | Reclassification for retrospective adoption
Recent Accounting Pronouncements
Other current assets and other non-current assets		(0.9)
Current portion of long-term debt and long-term debt		(0.9)
US Dollar notes under the Note Purchase Agreement
Recent Accounting Pronouncements
Debt issuance costs	$ 0.8	$ 0.9