Leases - Components of Lease Expense (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 28, 2020	Jun. 30, 2019	Jun. 28, 2020	Jun. 30, 2019
Leases [Abstract]
Operating lease cost	$ 33.6	$ 28.8	$ 66.3	$ 56.1
Finance lease cost:
Amortization of right-of-use assets	3.6	3.8	7.3	7.6
Interest on lease liabilities	0.3	0.2	0.5	0.5
Total finance lease cost	$ 3.9	$ 4.0	$ 7.8	$ 8.1