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Additional Financial Information (Supplemental Cash Flow Information) (Details) - USD ($) $ in Millions | 6 Months Ended
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Sep. 30, 2021 | Sep. 30, 2020
Non-cash investing activities |  |
Accrued equity-method investment | $ 19.0 | $ 0.0
Decrease in finance lease right-of-use asset due to a reassessment event | 0.0 | (42.0)
Non-cash financing activities |  |
Decrease in finance lease liability due to a reassessment event | 0.0 | (48.6)
Right-of-use assets obtained in exchange for new lease obligations: |  |
Operating leases | 38.8 | 10.4
Increase in right-of-use assets and lease liability due to a reassessment event(1): |  |
Operating leases - increase in right-of-use assets | 0.0 | 6.0
Operating leases - increase in lease liability | $ 0.0 | $ 12.6

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