Pension and Other Post Retirement Plans (Details 4) $ in Millions	12 Months Ended
	Dec. 31, 2023 USD ($)
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Expected Future Employer Contributions, Next Fiscal Year, Description	Required U.S. pension contributions under Employee Retirement Income Security Act (ERISA) regulations are expected to be zero in 2024 and discretionary contributions are not expected in 2024. SERP and post-retirement medical plan contributions in 2024 are expected to be $7.9. Expected contributions to the U.K. Prestwick plan for 2024 are $1.0. Expected contributions to the U.K. (Belfast) plans for 2024 are $1.9.
Pension Plan [Member] | UNITED STATES
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Expected Future Benefit Payment, Next Twelve Months	$ 0.1
Defined Benefit Plan, Expected Future Benefit Payment, Year Two	0.1
Defined Benefit Plan, Expected Future Benefit Payment, Year Three	0.1
Defined Benefit Plan, Expected Future Benefit Payment, Year Four	0.1
Defined Benefit Plan, Expected Future Benefit Payment, Year Five	0.1
Defined Benefit Plan, Expected Future Benefit Payment, Five Fiscal Years Thereafter	0.4
Pension Plan [Member] | UNITED KINGDOM
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Expected Future Benefit Payment, Next Twelve Months	0.9
Defined Benefit Plan, Expected Future Benefit Payment, Year Two	1.0
Defined Benefit Plan, Expected Future Benefit Payment, Year Three	1.3
Defined Benefit Plan, Expected Future Benefit Payment, Year Four	1.5
Defined Benefit Plan, Expected Future Benefit Payment, Year Five	1.7
Defined Benefit Plan, Expected Future Benefit Payment, Five Fiscal Years Thereafter	9.4
Pension Plan [Member] | Belfast
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Expected Future Benefit Payment, Next Twelve Months	55.2
Defined Benefit Plan, Expected Future Benefit Payment, Year Two	58.8
Defined Benefit Plan, Expected Future Benefit Payment, Year Three	64.3
Defined Benefit Plan, Expected Future Benefit Payment, Year Four	68.9
Defined Benefit Plan, Expected Future Benefit Payment, Year Five	75.8
Defined Benefit Plan, Expected Future Benefit Payment, Five Fiscal Years Thereafter	458.6
Other Benefits [Member] | UNITED STATES
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Expected Future Benefit Payment, Next Twelve Months	7.8
Defined Benefit Plan, Expected Future Benefit Payment, Year Two	6.8
Defined Benefit Plan, Expected Future Benefit Payment, Year Three	6.0
Defined Benefit Plan, Expected Future Benefit Payment, Year Four	5.7
Defined Benefit Plan, Expected Future Benefit Payment, Year Five	4.9
Defined Benefit Plan, Expected Future Benefit Payment, Five Fiscal Years Thereafter	10.8
Other Benefits [Member] | Belfast
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Expected Future Benefit Payment, Next Twelve Months	0.0
Defined Benefit Plan, Expected Future Benefit Payment, Year Two	0.0
Defined Benefit Plan, Expected Future Benefit Payment, Year Three	0.0
Defined Benefit Plan, Expected Future Benefit Payment, Year Four	0.0
Defined Benefit Plan, Expected Future Benefit Payment, Year Five	0.0
Defined Benefit Plan, Expected Future Benefit Payment, Five Fiscal Years Thereafter	$ 0.1