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Accumulated Other Comprehensive Loss - Schedule of Reclassifications of Recognized Transactions out of AOCI (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Dec. 31, 2019 | Dec. 31, 2018
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |  |  |
Other loss, net | $ (1.5) |  |  | $ (2.5) |  |  | $ (0.2) | $ (12.4)
Net income | 311.1 | $ 108.9 | $ 50.7 | 49.2 | $ 96.3 | $ 35.7 | 470.7 | 181.2
Reclassification out of Accumulated Other Comprehensive Income |  |  |  |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |  |  |
Net income | (0.2) |  |  | (0.3) |  |  | (0.6) | (6.4)
Reclassification out of Accumulated Other Comprehensive Income | Unrealized losses on available-for-sale debt securities |  |  |  |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |  |  |
Other loss, net | 0.0 |  |  | 0.0 |  |  | 0.0 | (5.6)
Reclassification out of Accumulated Other Comprehensive Income | Amortization of actuarial loss |  |  |  |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |  |  |
Other loss, net | $ (0.2) |  |  | $ (0.3) |  |  | $ (0.6) | $ (0.8)

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