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Comprehensive Income (Loss) - Schedule of Reclassifications of Recognized Transactions out of AOCI (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Other income (loss) | $ (2.5) | $ (2.9) | $ (12.4) | $ 7.4
Net income | 49.2 | (251.1) | 181.2 | 108.7
Reclassification out of accumulated other comprehensive income |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Net income | (0.3) | (0.2) | (6.4) | (0.6)
Reclassification out of accumulated other comprehensive income | Unrealized holding gains (losses) available-for-sale debt securities |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Other income (loss) | 0.0 | 0.0 | (5.6) | 0.0
Reclassification out of accumulated other comprehensive income | Amortization of actuarial loss |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Other income (loss) | $ (0.3) | $ (0.2) | $ (0.8) | $ (0.6)

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