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Schedule of Valuation and Qualifying Accounts (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Valuation and Qualifying Accounts Disclosure [Line Items]
Provision for Doubtful Accounts	$ 1.4	$ 0.2	$ (0.3)
Allowance for Doubtful Accounts [Member]
Valuation and Qualifying Accounts Disclosure [Line Items]
Valuation Allowances and Reserves, Balance	1.7	2.3	3.0
Provision for Doubtful Accounts		0.2	(0.3)
Valuation Allowances and Reserves, Balance	2.8	1.7	2.3
Valuation Allowances and Reserves, Deductions	$ (0.3)	$ (0.8)	$ (0.4)

Amount of the current period expense charged against operations, the offset which is generally to the allowance for doubtful accounts for the purpose of reducing receivables, including notes receivable, to an amount that approximates their net realizable value (the amount expected to be collected).

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