Business and Summary of Significant Accounting Policies - Store Count by Ownership Type (Footnote) (Details)	12 Months Ended
	Dec. 31, 2016 transaction store	Dec. 31, 2015 store	Dec. 31, 2014 store
Significant Accounting Policies [Line Items]
Franchises granted (in number of stores) | store	749	813	920
Operating Segments | Progressive
Significant Accounting Policies [Line Items]
Virtual lease to own transactions completed (at least) | transaction	1