Business and Summary of Significant Accounting Policies Operating Leases (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Jan. 02, 2016
Other Current Liabilities [Member]
Property and equipment [Line Items]
Deferred Rent Credit, Current	$ 0.2	$ 0.4
Deferred Lease Incentives, Current	2.9	2.8
Other Noncurrent Liabilities [Member]
Property and equipment [Line Items]
Deferred Rent Credit, Noncurrent	9.6	7.5
Deferred Lease Incentives, Noncurrent	$ 8.9	$ 7.9
Minimum [Member]
Property and equipment [Line Items]
Lessee Leasing Arrangements, Operating Leases, Term of Contract	5 years
Maximum [Member]
Property and equipment [Line Items]
Lessee Leasing Arrangements, Operating Leases, Term of Contract	10 years