Retirement Benefits (Details 4) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Jan. 01, 2023	Jan. 02, 2022
Pension Benefits [Member]
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Benefit obligation at beginning of year	$ 1,818.3	$ 2,517.0
Service cost	6.0	11.9	$ 15.1
Interest cost	79.7	69.7	68.4
Benefits paid	(153.9)	(155.6)
Subsidy paid	0.0	0.0
Divestiture	0.0	(75.8)
Effect of currency rates	0.0	(3.2)
Net actuarial (gains) losses - discount rate change	(95.8)	(556.8)
Net actuarial (gains) losses - other	(5.3)	11.1
Plan settlement	(1,350.6)	0.0
Benefit obligation at end of year	298.4	1,818.3	2,517.0
Other Postretirement Benefits
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Benefit obligation at beginning of year	212.7	287.3
Service cost	0.6	1.1	1.5
Interest cost	10.9	7.7	8.0
Benefits paid	(26.4)	(29.7)
Subsidy paid	0.0	0.3
Divestiture	0.0	0.0
Effect of currency rates	0.0	0.0
Net actuarial (gains) losses - discount rate change	0.7	(48.2)
Net actuarial (gains) losses - other	3.1	(5.8)
Plan settlement	0.0	0.0	(43.0)
Benefit obligation at end of year	$ 201.6	$ 212.7	$ 287.3