Business Overview - Allowance for Credit Losses Rollforward (Details) - USD ($) $ in Millions	6 Months Ended
	Jun. 26, 2020	Jan. 01, 2020
Accounts And Financing Receivable, Allowance For Credit Loss [Roll Forward]
Beginning balance	$ 82.1
Transition Adjustment	125.1
Provision	30.3
Write-offs	(26.7)
FX and Other	(0.6)
Ending balance	125.1
Cumulative Effect, Period of Adoption, Adjustment
Accounts And Financing Receivable, Allowance For Credit Loss [Roll Forward]
Beginning balance	40.0
Transition Adjustment	$ 40.0	$ 40.0