Accumulated Other Comprehensive Loss (Reclassifications Out of Accumulated OCI) (Details) - USD ($) $ in Millions	3 Months Ended				6 Months Ended
	Jun. 30, 2019	Mar. 31, 2019	Jul. 01, 2018	Apr. 01, 2018	Jun. 30, 2019	Jul. 01, 2018
(Gain) loss on cash flow hedges:
(Gain) loss recognized in income on derivatives	$ 463.6		$ 447.0		$ 927.5	$ 885.2
Income tax impact	23.3		18.5		40.9	34.2
Total	(104.6)	$ (75.3)	(85.9)	$ (66.5)	(179.9)	(152.4)
Amortization of defined benefit pension and postretirement plan items:
Total	5.7		(0.4)		8.9	4.9
Cash Flow Hedges and Other
Amortization of defined benefit pension and postretirement plan items:
Total	0.8				(0.6)
Cash Flow Hedges
Amortization of defined benefit pension and postretirement plan items:
Total			(5.5)			(4.5)
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)
Net Actuarial Loss
Amortization of defined benefit pension and postretirement plan items:
Amortization of defined benefit pension and postretirement plan items:	7.9		8.1		15.5	15.4
Pension and Postretirement Benefits
Amortization of defined benefit pension and postretirement plan items:
Amortization of defined benefit pension and postretirement plan items:	6.4		6.6		12.5	12.4
Income tax impact	(1.5)		(1.5)		(3.0)	(3.0)
Total	4.9		5.1		9.5	9.4
Amount Reclassified from AOCI | Cash Flow Hedges and Other
(Gain) loss on cash flow hedges:
(Gain) loss recognized in income on derivatives	1.1				(0.9)
Income tax impact	(0.3)				0.3
Total	$ 0.8				$ (0.6)
Amount Reclassified from AOCI | Cash Flow Hedges
(Gain) loss on cash flow hedges:
(Gain) loss recognized in income on derivatives			(7.4)			(6.1)
Income tax impact			1.9			1.6
Total			$ (5.5)			$ (4.5)