Fair Value Measurements and Risk - Financial Asset and Liabilities (Details) - USD ($) $ in Millions	Mar. 31, 2018	Dec. 31, 2017
Assets
Total Assets	$ 3.2	$ 3.1
Liabilities
Total Liabilities	41.5	25.6
Fair Value, Measurements, Recurring
Assets
Currency derivatives	2.6	3.1
Interest rate derivatives	0.6
Total Assets	3.2	3.1
Liabilities
Interest rate derivatives	0.2	1.8
Currency derivatives	41.3	23.8
Total Liabilities	41.5	25.6
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2)
Assets
Currency derivatives	2.6	3.1
Interest rate derivatives	0.6
Total Assets	3.2	3.1
Liabilities
Interest rate derivatives	0.2	1.8
Currency derivatives	41.3	23.8
Total Liabilities	$ 41.5	$ 25.6