Accumulated Other Comprehensive Loss - Reclassifications Out of Accumulated OCI (Details) - USD ($) $ in Millions	3 Months Ended
	Apr. 04, 2021	Mar. 29, 2020
(Gain) loss on cash flow hedges:
Gain recognized in income on derivatives	$ (492.5)	$ (492.6)
Income tax impact	16.6	18.8
Total	84.7	82.2
Amortization of defined benefit pension and postretirement plan items:
Amortization of defined benefit pension and postretirement plan items	101.3	101.0
Income tax impact	(16.6)	(18.8)
Amount Reclassified from AOCI | Cash Flow Hedges and Other
(Gain) loss on cash flow hedges:
Gain recognized in income on derivatives	(12.9)	(3.1)
Income tax impact	(3.3)	(0.8)
Total	(9.6)	(2.3)
Amortization of defined benefit pension and postretirement plan items:
Income tax impact	3.3	0.8
Amount Reclassified from AOCI | Amortization of prior service cost
Amortization of defined benefit pension and postretirement plan items:
Amortization of defined benefit pension and postretirement plan items	(0.9)	(1.5)
Amount Reclassified from AOCI | Amortization of net actuarial loss
Amortization of defined benefit pension and postretirement plan items:
Amortization of defined benefit pension and postretirement plan items	6.6	6.0
Amount Reclassified from AOCI | Pension and Postretirement Benefits
(Gain) loss on cash flow hedges:
Income tax impact	1.4	1.0
Amortization of defined benefit pension and postretirement plan items:
Amortization of defined benefit pension and postretirement plan items	5.7	4.5
Income tax impact	(1.4)	(1.0)
Total	$ 4.3	$ 3.5