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Derivatives (Narratives) (Details) - USD ($) $ in Millions | 6 Months Ended
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Sep. 30, 2025 | Sep. 30, 2024
AOCI Attributable to Parent [Abstract] |  |
Investment Income, Net | $ 5.9 | $ 6.5
Decrease, fair value, cash flow hedges |  |
AOCI Attributable to Parent [Abstract] |  |
Increase (Decrease) in Fair Value of Interest Rate Fair Value Hedging Instruments | 4.4 | 0.2
Reclassified AOCI |  |
AOCI Attributable to Parent [Abstract] |  |
Increase (Decrease) in Fair Value of Interest Rate Fair Value Hedging Instruments | 3.6 | $ 8.2
Reclassification net gains Interest Rate Contracts |  |
AOCI Attributable to Parent [Abstract] |  |
Increase (Decrease) in Fair Value of Interest Rate Fair Value Hedging Instruments | $ 2.5 |

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- Definition Amount of unrealized gain (loss) related to the fair value of interest rate derivatives designated as fair value hedging instruments, as offset by the gain (loss) on the hedged item to the extent that the fair value hedge is determined to be effective. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 815 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 4A -Subparagraph (b)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480434/815-10-50-4A Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 815 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 4C -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480434/815-10-50-4C + Details
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