Contingencies (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		12 Months Ended		3 Months Ended	12 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Dec. 31, 2008	Dec. 31, 2012	Mar. 31, 2013 Asbestos Issue [Member]	Dec. 31, 2012 Asbestos Issue [Member]
Accrual for environmental loss contingencies [Abstract]
Waste disposal sites with potential liability under the Comprehensive Environmental Response, Compensation and Liability Act	33
Accrual for indicated environmental liabilities	$ 3.7			$ 3.9
Timeframe most environmental liabilities will be paid out		5
Contingencies [Abstract]
Loss as a result of the September 2008 DTP ruling			4.0
Number of pending claims					16,000	16,000
Payment being made to a claimant by or on behalf of the company					70	308
Payment being made to a claimant by or on behalf of the company, percentage					19.00%	13.00%
Loss Contingency, Claims Settled and Dismissed, Number					376	2,400
Company paid in defense and indemnity in advance of insurers reimbursement					243.4
Cash and notes received from insurers					124.8
Outstanding balance to be fully recovered					118.6	111.0
Outstanding balance expected to be recovered in the next twelve months					20.0
Assets:
Prepayments and other current assets					0	0
Other non-current assets					95.2	85.6
Total insurance assets					95.2	85.6
Liabilities:
Accounts payable and accrued expenses					39.2	36.5
Other non-current liabilities					56.0	49.1
Total accrued liabilities					$ 95.2	$ 85.6