Property and Equipment (Details) - USD ($) $ in Millions	Dec. 30, 2018	Dec. 31, 2017
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 156.7	$ 126.8
Accumulated depreciation	68.3	51.3
Total property and equipment, net	88.4	75.5
Land
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	12.2	14.5
Buildings
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	7.9	8.6
Leasehold improvements
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	20.5	17.0
Branch equipment
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	36.8	24.8
Office furniture and fixtures
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	19.1	14.6
Vehicles
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	58.1	44.2
Tooling
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	0.1	0.1
Construction in process
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 2.0	$ 3.0