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Accumulated Other Comprehensive Loss - Schedule of Reclassifications of Recognized Transactions out of AOCI (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
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Mar. 31, 2020 | Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2020 | Mar. 31, 2019 | Mar. 31, 2018
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |  |  |  |  |  |
Other income, net |  |  |  |  |  |  |  |  | $ 3.2 | $ (2.2) | $ (5.8)
Net income | $ 99.9 | $ 311.1 | $ 108.9 | $ 50.7 | $ 174.7 | $ 49.2 | $ 96.3 | $ 35.7 | 570.6 | 355.9 | 255.4
Reclassification out of Accumulated Other Comprehensive Income |  |  |  |  |  |  |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net income |  |  |  |  |  |  |  |  | (0.8) | (6.6) | (16.0)
Reclassification out of Accumulated Other Comprehensive Income | Unrealized losses on available-for-sale securities |  |  |  |  |  |  |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |  |  |  |  |  |
Other income, net |  |  |  |  |  |  |  |  | 0.0 | (5.6) | (15.2)
Reclassification out of Accumulated Other Comprehensive Income | Amortization of actuarial loss |  |  |  |  |  |  |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |  |  |  |  |  |
Other income, net |  |  |  |  |  |  |  |  | $ (0.8) | $ (1.0) | $ (0.8)

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