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Comprehensive Income (Loss) (Schedule of Reclassifications of Recognized Transactions out of AOCI) (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Jun. 30, 2018 | Jun. 30, 2017
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |
Other income (loss) | $ (9.8) | $ 4.5
Net income | 35.7 | 170.6
Unrealized holding gains (losses) on available-for-sale securities | Reclassification out of Accumulated Other Comprehensive Income |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |
Other income (loss) | 5.6 | 0.0
Net income | 5.9 | 0.2
Amortization of actuarial loss | Reclassification out of Accumulated Other Comprehensive Income |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |
Other income (loss) | $ 0.3 | $ 0.2

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