SCHEDULE II VALUATION AND QUALIFYING ACCOUNTS (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Allowances for Doubtful Accounts
Valuation Allowances and Reserves
Balance at beginning of period	$ 8.3	$ 6.2	$ 7.0
Provision	0.2	0.4	0.4
Bad debts written off			(0.6)
Release of valuation allowance/other	(2.2)	1.7	(0.6)
Balance at end of period	6.3	8.3	6.2
Valuation Allowance on Deferred Tax Assets
Valuation Allowances and Reserves
Balance at beginning of period	3.3		16.6
Provision	3.7	3.3
Release of valuation allowance/other			(16.6)
Balance at end of period	$ 7.0	$ 3.3