Basis and Summary of Significant Accounting Policies - Narrative (Details) shares in Thousands, £ in Millions, $ in Millions		3 Months Ended		6 Months Ended	9 Months Ended
	Jan. 29, 2016 USD ($)	Sep. 30, 2016 USD ($) shares	Sep. 30, 2015 USD ($) shares	Jun. 30, 2016	Sep. 30, 2016 USD ($) shares	Sep. 30, 2015 USD ($) shares	Sep. 30, 2016 GBP (£) Store state	Sep. 30, 2016 USD ($) 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		1,193	281		1,102	431
Inventory valuation reserves								$ 31.9			$ 33.4
Lease merchandise adjustments		$ 36.6	$ 38.8		$ 98.6	$ 98.3
Assets held for sale								$ 9.3			7.0
Proceeds from sales of building	$ 13.6
Debt
Significant Accounting Policies [Line Items]
Debt issuance costs											(3.7)
Accounting Standards Update 2015-03
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							57	57
Held to maturity securities							£ 16.1	$ 20.9		£ 15.1	$ 22.2
Investment interest rate		12.00%		10.00%
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