Contingencies (Details) (USD $) In Millions, unless otherwise specified	1 Months Ended	3 Months Ended			12 Months Ended		24 Months Ended
	Jul. 31, 2010	Mar. 31, 2012	Mar. 31, 2011	Jun. 30, 2010	Dec. 31, 2010	Dec. 31, 2008	Dec. 31, 2008	Dec. 31, 2011	Feb. 28, 2011	Nov. 30, 2010
Contingencies (Textuals) [Abstract]
Loss as a result of the September 2008 DTP ruling						$ 4.0
Waste disposal sites with potential liability under the Comprehensive Environmental Response, Compensation and Liability Act		38
Accrual for indicated environmental liabilities		6.7						10.4
Timeframe most environmental liabilities will be paid out			5
Number of plaintiffs included in lawsuits in 2007 and 2008							340
Number of unfiled claimants settled in July 2010	2,700
Amount agreed to pay against settlement of unfiled claimants				28.0
First Settlement Payment Made										13.9
Final Settlement Payment Due									13.9
Pending asbestos related product liability claims		16,000						16,000
Claims resolved		800			1,800
Payment being made to a claimant by or on behalf of the company		74			288
Payment being made to a claimant by or on behalf of the company, percentage		9.30%			16.00%
Company paid in defense and indemnity in advance of insurers reimbursement		200.6
Cash and notes received from insurers		81.1
Outstanding balance to be fully recovered		119.5						109.8
Outstanding balance expected to be recovered in the next twelve months		34.7
Insurance carrier reimbursement		100.00%
Estimated future settlement of existing claims [Member]
Assets:
Prepayments and other current assets		28.9						28.8
Other non-current assets		35.2						32.9
Total insurance assets		64.1						61.7
Liabilities:
Accounts payable and accrued expenses		28.9						28.8
Other non-current liabilities		35.2						32.9
Total accrued liabilities		$ 64.1						$ 61.7