Retirement Benefits (Details 5) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Oct. 01, 2023	Dec. 29, 2024	Dec. 31, 2023
Pension Benefits [Member]
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets at beginning of year		$ 289.1	$ 1,599.5
Actual returns on plan assets and plan expenses		(9.1)	(83.9)
Employer contributions	$ 222.0	3.3	278.0
Plan settlement		0.0	(1,350.6)
Benefits paid		(3.5)	(153.9)
Fair value of plan assets at end of year		279.8	289.1
Other Postretirement Benefits
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets at beginning of year		0.0	0.0
Actual returns on plan assets and plan expenses		0.0	0.0
Employer contributions		0.0	0.0
Plan settlement		0.0	0.0
Benefits paid		0.0	0.0
Fair value of plan assets at end of year		$ 0.0	$ 0.0