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Schedule of Net Pension Expense (Details) - USD ($) $ in Millions | 12 Months Ended
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Mar. 31, 2018 | Mar. 31, 2017
Retirement Benefits [Abstract] |  |
Service costs | $ 2.2 | $ 1.4
Interest costs | 1.0 | 1.0
Amortization of actuarial loss | (0.8) | 0.0
Settlements | 0.0 | 0.5
Net pension period cost | $ 4.0 | $ 2.9

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