Inventories (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013	Dec. 31, 2013
Inventory Disclosure [Abstract]
Inventories at FIFO, net of reserves	$ 401.1		$ 488.2
Less: LIFO reserve	(101.8)		(99.0)
Total inventories at LIFO, net of reserves	299.3		389.2
LIFO expense	$ 2.8	$ 2.9