Receivables - Finance and Contract Receivables Allowance for Credit Losses Rollforward (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 26, 2020	Sep. 28, 2019	Sep. 26, 2020	Sep. 28, 2019
Allowances for credit losses:
Beginning of period			$ 67.5
Finance Receivables
Allowances for credit losses:
Beginning of period	$ 72.5	$ 60.9	61.9	$ 61.4
Impact of adopting ASU No. 2016-13	0.0		5.2
Provision for credit losses	9.8	11.4	41.2	35.8
Charge-offs	(9.5)	(13.0)	(39.6)	(41.9)
Recoveries	2.1	1.9	6.3	5.9
Currency translation	0.1	(0.1)	0.0	(0.1)
End of period	75.0	61.1	75.0	61.1
Contract Receivables
Allowances for credit losses:
Beginning of period	9.1	5.0	5.6	4.3
Impact of adopting ASU No. 2016-13	0.0		2.9
Provision for credit losses	0.5	1.9	3.1	4.0
Charge-offs	(0.7)	(1.0)	(2.9)	(2.7)
Recoveries	0.1	0.0	0.3	0.3
Currency translation	0.0	0.1	0.0	0.1
End of period	$ 9.0	$ 6.0	$ 9.0	$ 6.0