Fair Value Measurements and Risk - Financial Asset and Liabilities (Details) - USD ($) $ in Millions	Sep. 30, 2018	Dec. 31, 2017
Assets
Total Assets	$ 21.7	$ 3.1
Liabilities
Total Liabilities	22.8	25.6
Fair Value, Measurements, Recurring
Assets
Total Assets	21.7	3.1
Liabilities
Total Liabilities	22.8	25.6
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Assets or Liabilities (Level 1)
Assets
Total Assets	0.0	0.0
Liabilities
Total Liabilities	0.0	0.0
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2)
Assets
Total Assets	21.7	3.1
Liabilities
Total Liabilities	22.8	25.6
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3)
Assets
Total Assets	0.0	0.0
Liabilities
Total Liabilities	0.0	0.0
Currency derivatives | Fair Value, Measurements, Recurring
Assets
Total Assets	3.3	3.1
Liabilities
Total Liabilities	22.8	23.8
Currency derivatives | Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Assets or Liabilities (Level 1)
Assets
Total Assets	0.0	0.0
Liabilities
Total Liabilities	0.0	0.0
Currency derivatives | Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2)
Assets
Total Assets	3.3	3.1
Liabilities
Total Liabilities	22.8	23.8
Currency derivatives | Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3)
Assets
Total Assets	0.0	0.0
Liabilities
Total Liabilities	0.0	0.0
Interest rate derivatives | Fair Value, Measurements, Recurring
Assets
Total Assets	1.0
Liabilities
Total Liabilities		1.8
Interest rate derivatives | Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Assets or Liabilities (Level 1)
Assets
Total Assets	0.0
Liabilities
Total Liabilities		0.0
Interest rate derivatives | Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2)
Assets
Total Assets	1.0
Liabilities
Total Liabilities		1.8
Interest rate derivatives | Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3)
Assets
Total Assets	0.0
Liabilities
Total Liabilities		$ 0.0
Variable-to-fixed cross-currency derivatives | Fair Value, Measurements, Recurring
Assets
Total Assets	17.4
Variable-to-fixed cross-currency derivatives | Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Assets or Liabilities (Level 1)
Assets
Total Assets	0.0
Variable-to-fixed cross-currency derivatives | Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2)
Assets
Total Assets	17.4
Variable-to-fixed cross-currency derivatives | Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3)
Assets
Total Assets	$ 0.0