Retirement Benefits - Narrative (Details) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021
Defined Benefit Plan Disclosure [Line Items]
Contributions by employer	$ 3.9
Actuarial loss		$ 9.7
Deferred pension cost (reversal of cost)		10.7
Increase in plan assets		$ 1.0
Other current assets
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, assets	0.8
Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Expected contribution for next fiscal year	4.0
Other Postretirement Benefits
Defined Benefit Plan Disclosure [Line Items]
Expected contribution for next fiscal year	$ 1.2