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Interim Financial Statements - Assets Held For Sale, Discontinued Operations and Fair Value (Details) $ in Millions	1 Months Ended	3 Months Ended		6 Months Ended
	Feb. 28, 2015 USD ($)	Jun. 30, 2016 USD ($)	Jun. 30, 2015 USD ($)	Jun. 30, 2016 USD ($) item	Jun. 30, 2015 USD ($)	May 31, 2016	Dec. 31, 2015 USD ($)	Nov. 30, 2014	Aug. 31, 2012
Combined financial information regarding entities accounted for as discontinued operations
Number of entities newly classified as held for sale \| item				0
Balance Sheet information regarding entities accounted for as discontinued operations
Total assets		$ 6.8		$ 6.8			$ 12.7
Total liabilities		4.6		4.6			6.2
Fair Value of Financial Instruments
Debt instrument, Carrying Value		$ 1,660.8		$ 1,660.8			$ 1,275.0
5.75% senior subordinated notes due 2022
Fair Value of Financial Instruments
Interest rate (as a percent)		5.75%		5.75%			5.75%		5.75%
Debt instrument, Carrying Value		$ 544.7		$ 544.7			$ 544.3
5.75% senior subordinated notes due 2022 \| Fair Value, Inputs, Level 2
Fair Value of Financial Instruments
Debt instrument, Fair Value		$ 544.7		$ 544.7			$ 558.6
5.375% Senior Subordinated Notes Due 2024
Fair Value of Financial Instruments
Interest rate (as a percent)		5.375%		5.375%			5.375%	5.375%
Debt instrument, Carrying Value		$ 296.6		$ 296.6			$ 296.4
5.375% Senior Subordinated Notes Due 2024 \| Fair Value, Inputs, Level 2
Fair Value of Financial Instruments
Debt instrument, Fair Value		$ 293.3		$ 293.3			295.7
5.50% senior subordinated notes due 2026
Fair Value of Financial Instruments
Interest rate (as a percent)		5.50%		5.50%		5.50%
Debt instrument, Carrying Value		$ 493.5		$ 493.5
5.50% senior subordinated notes due 2026 \| Fair Value, Inputs, Level 2
Fair Value of Financial Instruments
Debt instrument, Fair Value		468.8		468.8
Mortgage facilities
Fair Value of Financial Instruments
Debt instrument, Carrying Value		204.4		204.4			165.8
Mortgage facilities \| Fair Value, Inputs, Level 2
Fair Value of Financial Instruments
Debt instrument, Fair Value		213.9		$ 213.9			165.8
Retail Automotive Franchise
Divestitures
Number of franchises disposed \| item				8
Retail Automotive Franchise \| Disposed of by sale
Divestitures
Number of franchises disposed \| item				2
Retail Automotive Franchise \| Disposal group, not discontinued operations
Divestitures
Number of franchises disposed \| item				6
Retail Commercial Truck Parts Locations
Divestitures
Number of locations disposed \| item				1
Hertz car rental franchise
Divestitures
Proceeds from sale of business	$ 17.8
Retail Automotive and Hertz car rental franchise \| Held-for-sale
Combined financial information regarding entities accounted for as discontinued operations
Revenues		5.6	$ 19.5	$ 14.0	$ 48.0
Pre-tax loss		(2.0)	(0.9)	(2.0)	(4.7)
Pre-tax gain on disposal			$ 0.6		$ 2.9
Balance Sheet information regarding entities accounted for as discontinued operations
Inventories		3.4		3.4			6.2
Other assets		3.4		3.4			6.5
Total assets		6.8		6.8			12.7
Floor plan notes payable (including non-trade)		2.9		2.9			4.3
Other liabilities		1.7		1.7			1.9
Total liabilities		$ 4.6		$ 4.6			$ 6.2