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Supplemental Financial Information - Comprehensive Income (Schedule Of Reclassifications Of Recognized Transactions Out Of AOCI) (Details) - USD ($) $ in Millions | 12 Months Ended
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Mar. 31, 2019 | Mar. 31, 2018 | Mar. 31, 2017
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |
Other (loss) income, net | $ (2.2) | $ (5.8) | $ 1.3
Net income | 355.9 | 255.4 | 164.6
Reclassification out of Accumulated Other Comprehensive Income |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |
Net income | (6.6) | (16.0) | (1.5)
Reclassification out of Accumulated Other Comprehensive Income | Unrealized Holding Gains (Losses) Available-for-sale Securities |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |
Other (loss) income, net | (5.6) | (15.2) | (1.5)
Reclassification out of Accumulated Other Comprehensive Income | Minimum Pension Liability |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |
Other (loss) income, net | $ (1.0) | $ (0.8) | $ 0.0

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