Discontinued Operations (Details) (Air Quality [Member], USD $) In Millions, unless otherwise specified	3 Months Ended	9 Months Ended
	Sep. 30, 2012	Sep. 30, 2012
Air Quality [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Discontinued Operation, Amount of Other Income (Loss) from Disposition of Discontinued Operations, before Income Tax	$ 116.7	$ 116.7
Discontinued Operation, Amount of Other Income (Loss) from Disposition of Discontinued Operation, Net of Tax	75.0	75.0
Impairment of Long-Lived Assets to be Disposed of	108.9	108.9
Impairment of Long-Lived Assets to be Disposed of (after tax)	$ 68.8	$ 68.8