Debt and Short-Term Borrowings - Notes Payable (Details) - USD ($) $ in Millions	Dec. 31, 2017	Dec. 31, 2016	Oct. 31, 2016	May 31, 2016	Jun. 30, 2015	Dec. 31, 2014
Debt Disclosure [Abstract]
Non interest bearing financing agreement amount			$ 1.1	$ 0.7	$ 1.1	$ 4.6
Notes payable	$ 1.0	$ 3.4