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Related-Party Transactions (Details) (NAR, USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012	Dec. 31, 2012 Accrued expenses	Sep. 30, 2013 Accounts payable
Related-party Transactions
Payment made to related party	$ 0.5	$ 0.5	$ 1.5	$ 1.5
Amount due to related party					$ 0.4	$ 0.5

Carrying amount as of the balance sheet date of obligations due all related parties. For classified balance sheets, represents the current portion of such liabilities (due within one year or within the normal operating cycle if longer).

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