Debt, Factoring and Customer Financing Arrangements - Accounts Receivable and Factoring Arrangements (Details) - USD ($) $ in Millions	Jun. 30, 2018	Dec. 31, 2017
Debt Disclosure [Abstract]
Off-balance sheet risks, face amount of asset	$ 234.0	$ 236.0
Off-balance sheet risks, amount utilized, asset	97.6	124.0
Amount under agreement	53.6	71.1
Utilized amount	$ 28.3	$ 34.6