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Retirement Benefits - Narrative (Details) $ in Millions	3 Months Ended
Retirement Benefits - Narrative (Details) $ in Millions	Mar. 31, 2022 USD ($)
Defined Benefit Plan Disclosure [Line Items]
Contributions by employer	$ 1.3
Other current assets
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, assets	7.9
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

Amount of asset, recognized in statement of financial position, for overfunded defined benefit pension and other postretirement plans.

Amount of contribution received by defined benefit plan from employer which increases plan assets.