Commitments and Contingencies - Schedule of Product Warranty (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Changes in accrued product warranty cost
Balance at the beginning of the period	$ 5.5	$ 6.1	$ 11.3
Warranty expense	3.0	5.1	3.5
Deductions and other	(4.9)	(5.7)	(8.7)
Balance at the end of the period	$ 3.6	$ 5.5	$ 6.1