Accumulated Other Comprehensive Loss - Reclassifications Out of Accumulated OCI (Details) - USD ($) $ in Millions	3 Months Ended						9 Months Ended
	Sep. 27, 2020	Jun. 28, 2020	Mar. 29, 2020	Sep. 29, 2019	Jun. 30, 2019	Mar. 31, 2019	Sep. 27, 2020	Sep. 29, 2019
(Gain) loss on cash flow hedges:
(Gain) loss recognized in income on derivatives	$ 458.5			$ 487.7			$ 1,411.7	$ 1,415.2
Income tax impact	25.8			16.7			58.8	57.6
Net income	(93.9)	$ (93.7)	$ (82.2)	(106.7)	$ (104.6)	$ (75.3)	(269.8)	(286.6)
Amortization of defined benefit pension and postretirement plan items:
Total	10.9			(0.1)			19.4	8.7
Cash Flow Hedges and Other
Amortization of defined benefit pension and postretirement plan items:
Total	8.0			(5.0)			9.8	(5.7)
Amortization of prior service cost
Amortization of defined benefit pension and postretirement plan items:
Amortization of defined benefit pension and postretirement plan items	(1.5)			(1.5)			(4.5)	(4.5)
Amortization of net actuarial loss
Amortization of defined benefit pension and postretirement plan items:
Amortization of defined benefit pension and postretirement plan items	5.4			8.0			17.1	23.3
Pension and Postretirement Benefits
Amortization of defined benefit pension and postretirement plan items:
Amortization of defined benefit pension and postretirement plan items	3.9			6.5			12.6	18.8
Income tax impact	(1.0)			(1.6)			(3.0)	(4.4)
Total	2.9			4.9			9.6	14.4
Amount Reclassified from AOCI | Cash Flow Hedges and Other
(Gain) loss on cash flow hedges:
(Gain) loss recognized in income on derivatives	10.8			(6.8)			13.2	(7.6)
Income tax impact	(2.8)			1.8			(3.4)	1.9
Net income	$ 8.0			$ (5.0)			$ 9.8	$ (5.7)