Supplementary Financial Statement Information Affiliates (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Schedule of Equity Method Investments [Line Items]
Revenue	$ 81.4	$ 88.9	$ 242.2	$ 247.2
Gross profit	21.2	24.5	66.7	69.2
Net income	1.8	6.4	8.8	15.7
Cost of Sales [Member]
Schedule of Equity Method Investments [Line Items]
Income from equity method investments	$ 0.3	$ 2.5	$ 2.4	$ 5.5