Derivatives (Narratives) (Details) - USD ($) $ in Millions	9 Months Ended
	Dec. 31, 2025	Dec. 31, 2024
AOCI Attributable to Parent [Abstract]
Investment Income, Net	$ 7.5	$ 5.0
Decrease, fair value, cash flow hedges
AOCI Attributable to Parent [Abstract]
Fair value, cash flow derivatives	4.0	4.4
Reclassified AOCI
AOCI Attributable to Parent [Abstract]
Fair value, cash flow derivatives	2.9	$ 9.4
Reclassification net gains Interest Rate Contracts
AOCI Attributable to Parent [Abstract]
Fair value, cash flow derivatives	$ 1.2