Accumulated Other Comprehensive Loss (Reclassifications Out of Accumulated OCI) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Oct. 01, 2017	Sep. 30, 2018	Oct. 01, 2017
(Gain) loss on cash flow hedges:
(Gain) loss recognized in income on derivatives	$ 446.2	$ 408.6	$ 1,331.4	$ 1,186.8
Income tax impact	9.9	12.7	44.1	39.1
Total	(90.3)	(69.0)	(242.7)	(159.6)
Amortization of defined benefit pension and postretirement plan items:
Total	4.8	4.5	9.8	16.3
Cash Flow Hedges
Amortization of defined benefit pension and postretirement plan items:
Total	0.0	1.3	(4.4)	6.3
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)
Net Actuarial Loss
Amortization of defined benefit pension and postretirement plan items:
Amortization of defined benefit pension and postretirement plan items	7.8	6.7	23.2	20.8
Pension and Postretirement Benefits
Amortization of defined benefit pension and postretirement plan items:
Amortization of defined benefit pension and postretirement plan items	6.3	5.2	18.7	16.3
Income tax impact	(1.5)	(2.0)	(4.5)	(6.3)
Total	4.8	3.2	14.2	10.0
Amount Reclassified from AOCI | Cash Flow Hedges
(Gain) loss on cash flow hedges:
(Gain) loss recognized in income on derivatives	0.0	1.8	(6.2)	8.5
Income tax impact	0.0	(0.5)	1.8	(2.2)
Total	$ 0.0	$ 1.3	$ (4.4)	$ 6.3