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Comprehensive Income (Loss) - Schedule of Reclassifications of Recognized Transactions out of AOCI (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Other income (loss) | $ (0.2) | $ 5.8 | $ (10.0) | $ 10.1
Net income | 96.3 | 189.2 | 132.0 | 359.7
Reclassification out of accumulated other comprehensive income |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Net income | 0.2 | 0.0 | 6.1 | 0.0
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) | $ 0.2 | $ 0.0 | $ 0.5 | $ 0.0

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