Retirement Benefits (Details 9) $ in Millions	Dec. 31, 2022 USD ($)
Defined Benefit Plan Disclosure [Line Items]
Amortization of prior service cost (credit)	$ (0.5)
Amortization of net actuarial loss	63.7
Amortization of accumulated other comprehensive loss	63.2
Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Amortization of prior service cost (credit)	0.4
Amortization of net actuarial loss	57.7
Amortization of accumulated other comprehensive loss	58.1
Other Postretirement Benefits
Defined Benefit Plan Disclosure [Line Items]
Amortization of prior service cost (credit)	(0.9)
Amortization of net actuarial loss	6.0
Amortization of accumulated other comprehensive loss	$ 5.1