Summary of Significant Accounting Policies - Property and Equipment At Cost and Depreciable Useful Lives (Details) - USD ($) $ in Millions	12 Months Ended
	Jan. 01, 2017	Jan. 03, 2016	Dec. 28, 2014
Property, Plant and Equipment [Line Items]
Property and equipment	$ 270.0	$ 361.8
Depreciation expense	20.7	21.4	$ 20.3
Land
Property, Plant and Equipment [Line Items]
Property and equipment	3.8	3.8
Work in process
Property, Plant and Equipment [Line Items]
Property and equipment	0.8	2.5
Buildings and improvements
Property, Plant and Equipment [Line Items]
Property and equipment	$ 61.1	60.2
Buildings and improvements | Minimum
Property, Plant and Equipment [Line Items]
Estimated useful life	15 years
Buildings and improvements | Maximum
Property, Plant and Equipment [Line Items]
Estimated useful life	45 years
Computer hardware and software
Property, Plant and Equipment [Line Items]
Property and equipment	$ 145.0	229.5
Computer hardware and software | Minimum
Property, Plant and Equipment [Line Items]
Estimated useful life	3 years
Computer hardware and software | Maximum
Property, Plant and Equipment [Line Items]
Estimated useful life	12 years
Equipment, furniture and fixtures
Property, Plant and Equipment [Line Items]
Property and equipment	$ 33.8	34.0
Estimated useful life	5 years
Leasehold improvements
Property, Plant and Equipment [Line Items]
Property and equipment	$ 25.5	$ 31.8
Leasehold improvements | Maximum
Property, Plant and Equipment [Line Items]
Estimated useful life	5 years