Retirement Benefits (Details 4) - USD ($) $ in Millions	12 Months Ended
	Dec. 29, 2024	Dec. 31, 2023	Jan. 01, 2023
Pension Benefits [Member]
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Benefit obligation at beginning of year	$ 298.4	$ 1,818.3
Service cost	5.8	6.0	$ 11.9
Interest cost	16.4	79.7	69.7
Benefits paid	(3.5)	(153.9)
Net actuarial (gains) losses - discount rate change	(9.7)	(95.8)
Net actuarial (gains) losses - other	(1.8)	(5.3)
Plan settlement	0.0	(1,350.6)
Benefit obligation at end of year	305.6	298.4	1,818.3
Other Postretirement Benefits
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Benefit obligation at beginning of year	201.6	212.7
Service cost	0.5	0.6	1.1
Interest cost	10.2	10.9	7.7
Benefits paid	(25.4)	(26.4)
Net actuarial (gains) losses - discount rate change	(2.5)	0.7
Net actuarial (gains) losses - other	4.8	3.1
Plan settlement	0.0	0.0
Benefit obligation at end of year	$ 189.2	$ 201.6	$ 212.7