Accumulated Other Comprehensive Loss - Reclassifications Out of Accumulated OCI (Details) - USD ($) $ in Millions	3 Months Ended				6 Months Ended
	Jun. 28, 2020	Mar. 29, 2020	Jun. 30, 2019	Mar. 31, 2019	Jun. 28, 2020	Jun. 30, 2019
(Gain) loss on cash flow hedges:
(Gain) loss recognized in income on derivatives	$ 460.6		$ 463.6		$ 953.2	$ 927.5
Income tax impact	14.2		23.3		33.0	40.9
Net income	(93.7)	$ (82.2)	(104.6)	$ (75.3)	(175.9)	(179.9)
Amortization of defined benefit pension and postretirement plan items:
Total	7.3		5.7		8.5	8.9
Cash Flow Hedges and Other
Amortization of defined benefit pension and postretirement plan items:
Total	4.1		0.8		1.8	(0.6)
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)		(3.0)	(3.0)
Amortization of net actuarial loss
Amortization of defined benefit pension and postretirement plan items:
Amortization of defined benefit pension and postretirement plan items	5.7		7.9		11.7	15.5
Pension and Postretirement Benefits
Amortization of defined benefit pension and postretirement plan items:
Amortization of defined benefit pension and postretirement plan items	4.2		6.4		8.7	12.5
Income tax impact	(1.0)		(1.5)		(2.0)	(3.0)
Total	3.2		4.9		6.7	9.5
Amount Reclassified from AOCI | Cash Flow Hedges and Other
(Gain) loss on cash flow hedges:
(Gain) loss recognized in income on derivatives	5.5		1.1		2.4	(0.9)
Income tax impact	(1.4)		(0.3)		(0.6)	0.3
Net income	$ 4.1		$ 0.8		$ 1.8	$ (0.6)