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Acquisitions (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended			1 Months Ended
	Dec. 31, 2014 stores	Dec. 31, 2013 stores	Dec. 31, 2012 stores	Feb. 28, 2015 stores	Jan. 31, 2015 stores
Subsequent Event [Line Items]
Number of stores purchased	5us-gaap_NumberOfBusinessesAcquired	5us-gaap_NumberOfBusinessesAcquired	6us-gaap_NumberOfBusinessesAcquired
Amounts incurred related to acquisitions, including capital leases and deferred purchase price commitments	$ 213.1	$ 95.7	$ 203.7
Subsequent Event [Member]
Subsequent Event [Line Items]
Number of stores purchased				1	1