Divestitures (Details) $ in Millions	3 Months Ended
	Mar. 31, 2015 USD ($) stores	Mar. 31, 2014 USD ($)
Import Stores Divested [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Number of stores divested | stores	2
Gain on disposal	$ 1.4
Gain on disposal, net of taxes	$ 0.9
Customer Lead Distribution Business [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Gain on disposal		$ 8.4
Gain on disposal, net of taxes		$ 5.2