Supplementary Financial Statement Information (Details2) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Schedule of Equity Method Investments [Line Items]
Revenue	$ 73.2	$ 72.4	$ 222.5	$ 216.4
Gross profit	20.5	24.6	69.6	73.1
Net income	3.4	8.1	18.8	24.6
Cost of Sales [Member]
Schedule of Equity Method Investments [Line Items]
Income from equity method investments	$ 1.0	$ 3.2	$ 6.6	$ 9.5