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Related Party Transactions (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Related Party Transactions [Abstract]
Auction commission revenues	$ 3.1	$ 4.8	$ 10.0
Accounts Receivable, Related Parties, Current	1.1	2.7
Due to Related Parties, Current	$ 0.5us-gaap_DueToRelatedPartiesCurrent

Amount of receivables arising from transactions with related parties due within one year or the normal operating cycle, if longer.

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- Definition

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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