Inventories (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Inventory Disclosure [Abstract]
Finished goods	$ 331.9	$ 287.2
Work in process	5.5	5.1
Raw materials and repair parts	199.2	183.4
Total	536.6	475.7
Excess of current cost over last-in, first-out cost	(52.4)	(57.2)
Total inventories, net	484.2	418.5
Pre-tax income (loss) from LIFO inventory liquidations	0.0	0.2	$ 0.2
Reserve balance obsolete and slow moving inventories	$ 20.1	$ 19.7