Discontinued Operations (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended							1 Months Ended	3 Months Ended	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009	Dec. 31, 2011 CWV	Dec. 31, 2010 CWV	Dec. 31, 2009 CWV	Mar. 31, 2010 CWV	Oct. 31, 2011 CWV Foreign Corrupt Practices Act (FCPA) Settlement	Jun. 30, 2009 TEAM	Dec. 31, 2011 TEAM	Dec. 31, 2010 TEAM	Dec. 31, 2009 TEAM	Dec. 31, 2010 Municipal Water Group	Dec. 31, 2009 Municipal Water Group
Discontinued Operations
Estimated reserve							$ 5.3
Amount of settlement entered into with the Securities and Exchange Commission to resolve allegations concerning potential violations of the FCPA								3.8
Gain (loss) on sale/disposal									(18.1)	0.2	(0.1)	(18.0)
Operating income (loss)				1.7	(5.7)	(5.3)						(0.3)
Costs and expenses														(0.3)
Write down of net assets					(0.1)	(8.5)
Adjustments to reserves for litigation													(0.1)	9.5
Income (loss) before income taxes	1.9	(6.0)	(22.9)
Income tax benefit (expense)	(0.2)	1.7	(0.7)
Income (loss) from discontinued operations, net of taxes	1.7	(4.3)	(23.6)
Total revenues discontinued operations			14.1			11.5						2.6
Carrying amounts of major classes of assets and liabilities
Prepaid expenses and other assets		0.4
Deferred income taxes		1.4
Assets of discontinued operations		1.8
Accrued expenses and other liabilities		5.8
Liabilities of discontinued operations		$ 5.8