Contingencies and Environmental Remediation (Details) (USD $) In Millions, unless otherwise specified			12 Months Ended
	Dec. 31, 2011	Mar. 31, 2010 CWV	Dec. 31, 2011 Asbestos Litigation lawsuit	Dec. 31, 2011 James Jones Litigation city
Litigation contingencies
Estimated reserve		$ 5.3
Number of lawsuits the entity is defending in different jurisdictions			47
Reasonably possible loss in excess of the amount accrued for its legal contingencies	3.3
Number of other cities on behalf of which lawsuit have been filed against company				42
Company's contribution to the settlement				15.3
Additional litigation expense				5.0
Non-cash, pre-tax gain in discontinued operations				$ 9.5