Contingencies (Details) (USD $) In Millions, unless otherwise specified	1 Months Ended	3 Months Ended			6 Months Ended		12 Months Ended	24 Months Ended				6 Months Ended	12 Months Ended
	Jul. 31, 2010	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2012	Jun. 30, 2011	Dec. 31, 2008	Dec. 31, 2008	Dec. 31, 2011	Feb. 28, 2011	Nov. 30, 2010	Jun. 30, 2012 Asbestos Issue [Member]	Dec. 31, 2011 Asbestos Issue [Member]
Accrual for environmental loss contingencies [Abstract]
Waste disposal sites with potential liability under the Comprehensive Environmental Response, Compensation and Liability Act					35
Accrual for indicated environmental liabilities		$ 4.6			$ 4.6				$ 10.4
Timeframe most environmental liabilities will be paid out						5
Number of plaintiffs								340
Number of claims settled and dismissed	2,700											1,400	1,800
Amount agreed to pay against settlement of unfiled claimants				28
First Settlement Payment Made											13.9
Final Settlement Payment Made										13.9
Contingencies [Abstract]
Loss as a result of the September 2008 DTP ruling		0	29.1		0	29.1	4.0
Number of pending claims												16,000	16,000
Payment being made to a claimant by or on behalf of the company												161	288
Payment being made to a claimant by or on behalf of the company, percentage												12.00%	16.00%
Company paid in defense and indemnity in advance of insurers reimbursement												213.4
Cash and notes received from insurers												81.1
Outstanding balance to be fully recovered												132.3	109.8
Outstanding balance expected to be recovered in the next twelve months												38.1
Insurance carrier reimbursement												100.00%
Assets:
Prepayments and other current assets												29.4	28.8
Other non-current assets												38.0	32.9
Total insurance assets												67.4	61.7
Liabilities:
Accounts payable and accrued expenses												29.4	28.8
Other non-current liabilities												38.0	32.9
Total accrued liabilities												$ 67.4	$ 61.7