Basis and Summary of Significant Accounting Policies - Narrative (Details) shares in Thousands, £ in Millions, $ in Millions		3 Months Ended		6 Months Ended
	Jan. 29, 2016 USD ($)	Jun. 30, 2016 USD ($) shares	Jun. 30, 2015 USD ($) shares	Jun. 30, 2016 USD ($) shares	Jun. 30, 2015 USD ($) shares	Jun. 30, 2016 GBP (£) Store state	Jun. 30, 2016 USD ($) Store state	May 13, 2016 Store	Dec. 31, 2015 GBP (£)	Dec. 31, 2015 USD ($)
Significant Accounting Policies [Line Items]
Anti-dilutive securities excluded from the computation of earnings per share assuming dilution (in shares) | shares		1,265	545	1,057	507
Inventory valuation reserves							$ 32.1			$ 33.4
Lease merchandise adjustments		$ 28.1	$ 30.2	$ 62.0	$ 59.5
Assets held for sale							$ 9.3			7.0
Proceeds from sales of building	$ 13.6
Debt and Capital Lease Obligations
Significant Accounting Policies [Line Items]
Debt issuance costs										(3.7)
Accounting Standards Update 2015-03 | Prepaid Expense and Other Assets
Significant Accounting Policies [Line Items]
Debt issuance costs										3.7
Building | Other operating expense (income), net
Significant Accounting Policies [Line Items]
Gain on sale of corporate office building	$ 11.1
Variable Interest Entity, Not Primary Beneficiary
Significant Accounting Policies [Line Items]
Number of retail stores | Store						69	69
Held to maturity securities						£ 15.7	$ 20.9		£ 15.1	$ 22.2
Progressive
Significant Accounting Policies [Line Items]
Number of states in which entity operates | state						46	46
Disposal Group, Held-for-sale, Not Discontinued Operations | HomeSmart
Significant Accounting Policies [Line Items]
Disposal group, number of stores | Store								82