Retirement Benefits (Details1) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jul. 02, 2023	Jun. 30, 2024	Jul. 02, 2023
Pension Plans Defined Benefit
Defined Benefit Plan Disclosure [Line Items]
Service cost - benefits earned during the year	$ 1.4	$ 1.6	$ 2.9	$ 3.2
Interest cost on benefits earned in prior years	4.1	24.0	8.2	48.0
Expected return on plan assets	(4.1)	(25.6)	(8.2)	(51.3)
Amortization of prior service cost (credit)	0.0	0.1	0.1	0.2
Amortization of net actuarial loss	0.0	0.0	0.0	0.0
Total retirement benefit expense	1.4	0.1	3.0	0.1
Other Postretirement Benefit Plan, Defined Benefit
Defined Benefit Plan Disclosure [Line Items]
Service cost - benefits earned during the year	0.1	0.1	0.2	0.3
Interest cost on benefits earned in prior years	2.6	2.8	5.1	5.5
Expected return on plan assets	0.0	0.0	0.0	0.0
Amortization of prior service cost (credit)	(0.2)	(0.3)	(0.4)	(0.5)
Amortization of net actuarial loss	1.3	1.5	2.6	3.0
Total retirement benefit expense	$ 3.8	$ 4.1	$ 7.5	$ 8.3