Central Merger and Restructuring, Merger and Integration Costs - Schedule of Acquisition Related Costs (Details) - Central Merger - USD ($) $ in Millions		3 Months Ended		6 Months Ended
	Sep. 27, 2016	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Acquisitions
Acquisition and integration related costs included in general and administrative expenses	$ 0.8	$ 1.0	$ 1.5	$ 1.1	$ 3.3
General and administrative expenses
Acquisitions
Acquisition and integration related costs included in general and administrative expenses		1.0	0.1	1.1	0.9
Depreciation and amortization
Acquisitions
Acquisition and integration related costs included in general and administrative expenses		$ 0.0	$ 1.4	$ 0.0	$ 2.4