Pensions - Narrative (Details) - Pension Plan - USD ($) $ in Millions	Dec. 31, 2022	Mar. 31, 2022	Mar. 31, 2021
Qualified Plan
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Expected future employer contribution, next fiscal year		$ 7.5	$ 5.0
Qualified Plan | Forecast
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Expected future employer contribution, next fiscal year	$ 25.0
Nonqualified Plan
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Expected future employer contribution, next fiscal year		$ 0.1	$ 0.7
Nonqualified Plan | Forecast
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Expected future employer contribution, next fiscal year	$ 1.1