Inventories (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Inventory Disclosure [Abstract]
Finished goods	$ 300.0	$ 338.2
Work in process	4.2	8.1
Raw materials and repair parts	178.3	182.6
Total	482.5	528.9
Excess of current cost over last-in, first-out cost	(63.7)	(65.6)
Total inventories, net	418.8	463.3
Pre-tax income (loss) from LIFO inventory liquidations	$ (0.2)	$ 0.9	$ (0.3)