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Employee Retirement Plans (Narrative) (Details) $ in Millions	3 Months Ended	9 Months Ended
	Dec. 31, 2020 USD ($)	Dec. 31, 2020 USD ($)
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Lump sum payout	$ 7.0
Settlement gain (loss), before tax	0.2
Non-qualified Plan
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Employer contributions		$ 0.3
Expected employer contributions, remainder of fiscal year	0.1	0.1
Qualified Plan
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Expected employer contributions, remainder of fiscal year	$ 3.0	$ 3.0

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Amount of payment, which decreases benefit obligation of defined benefit plan, for irrevocable action relieving primary responsibility for benefit obligation and eliminating risk for obligation and assets used to effect settlement. Transaction constituting settlement includes, but is not limited to, making lump-sum cash payment to participant in exchange for their rights to receive specified benefits and purchasing nonparticipating annuity contract. Excludes decreases to benefit obligation for remeasurement due to settlement.

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