Fair Value Measurements and Risk - Financial Asset and Liabilities (Details) - Fair Value, Measurements, Recurring - USD ($) $ in Millions	Sep. 30, 2017	Dec. 31, 2016
Assets
Currency derivatives	$ 3.3	$ 8.8
Total Assets	3.3	8.8
Liabilities
Interest rate derivatives	4.2	6.0
Currency derivatives	17.9	0.9
Total Liabilities	22.1	6.9
Quoted Prices in Active Markets for Identical Assets or Liabilities (Level 1)
Assets
Currency derivatives	0.0	0.0
Total Assets	0.0	0.0
Liabilities
Interest rate derivatives	0.0	0.0
Currency derivatives	0.0	0.0
Total Liabilities	0.0	0.0
Significant Other Observable Inputs (Level 2)
Assets
Currency derivatives	3.3	8.8
Total Assets	3.3	8.8
Liabilities
Interest rate derivatives	4.2	6.0
Currency derivatives	17.9	0.9
Total Liabilities	22.1	6.9
Significant Unobservable Inputs (Level 3)
Assets
Currency derivatives	0.0	0.0
Total Assets	0.0	0.0
Liabilities
Interest rate derivatives	0.0	0.0
Currency derivatives	0.0	0.0
Total Liabilities	$ 0.0	$ 0.0