Acquisitions and Divestitures - Fair Value of the Assets Acquired and Liabilities Assumed (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Assets:
Accounts receivable, net	$ 4.7	$ 25.6	$ 2.6
Inventories, net	2.3	23.6	6.1
Deferred charges and prepaid expenses	0.1	0.9	0
Other current assets	0.2	0.6	8.5
Property, plant and equipment—net	3.0	32.1	3.4
Goodwill	7.1	108.8	4.3
Other intangible assets	7.7	121.0	6.9
Other non-current assets	0	0.5	0
Total assets acquired	25.1	313.1	31.8
Liabilities:
Accounts payable, trade	2.3	10.7	8.7
Salaries, wages and benefits	0.3	5.1	0.5
Other current liabilities	1.8	5.2	0
Total liabilities assumed	4.4	21.0	9.2
Net assets acquired	$ 20.7	$ 292.1	$ 22.6