Current and Long-Term Financing - Outstanding Borrowings (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Debt Instruments [Abstract]
Line of Credit Facility, Amount Outstanding	$ 6.1	$ 116.0
Secured Debt	190.9	0.0
Secured Debt	73.9	68.5
Capital lease obligations and other	19.8	26.7
Total debt outstanding	290.7	211.2
Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net	4.1	0.0
Long-term Debt, Gross	294.8	211.2
Current portion of borrowings outstanding	74.5	129.0
Long-term portion of borrowings outstanding	216.2	82.2
Line of Credit Facility, Remaining Borrowing Capacity	212.7	175.2
Line of Credit Facility, Current Borrowing Capacity	$ 218.8	$ 291.2
Weighted average effective interest rate on total borrowings (including interest rate swap agreements)	3.90%	4.40%
Interest Paid	$ 13.6	$ 5.6	$ 3.6
Payments of Financing Costs	4.7	$ 1.7	$ 0.0
Other Borrowings	$ 80.0
Other Borrowings [Member]
Debt Instruments [Abstract]
Weighted average stated interest rate on total borrowings	5.20%	4.40%