Acquisitions - Narrative (Details) $ in Millions		3 Months Ended	12 Months Ended
	Apr. 01, 2019 USD ($) country	Mar. 27, 2020 USD ($) country	Dec. 31, 2018 USD ($)
Business Acquisition [Line Items]
Acquisitions		$ 13.2
Prepaid acquisition asset related to remaining Non-Principal Countries		31.1
Acquisitions, ASP
Business Acquisition [Line Items]
Net cash consideration	$ 2,700.0	$ 2,736.0
Revenue attributable to acquisition			$ 800.0
Number of principal countries | country	20
Number of non-principal countries | country	39
Number of principal countries, closed | country		20
Number of non-principal countries, closed | country		6
Percent of preliminary valuation in principal countries		99.00%
Percent of preliminary valuation in non-principal countries		1.00%
Prepaid acquisition asset related to remaining Non-Principal Countries		$ 31.1
Revenue since date of acquisition		159.0
Operating loss since date of acquisition		26.0
Amortization of intangible assets, acquisition-related fair value adjustments, and transaction costs		52.0
Transaction-related costs		$ 20.0