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Pension and Employee Benefit Plans, Cost Components of Pension Plans (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Mar. 31, 2019 | Mar. 31, 2018 | Mar. 31, 2017
Components of net periodic benefit cost [Abstract] |  |  |  |
Net periodic benefit cost | [1] | $ 2.9 | $ 3.3 | $ 2.9
Other changes in benefit obligation recognized in other comprehensive income (loss) [Abstract] |  |  |  |
Amortization of net actuarial loss | [2] | 5.4 | 5.6 |
Pension Plans [Member] |  |  |  |
Components of net periodic benefit cost [Abstract] |  |  |  |
Service cost |  | 0.5 | 0.5 | 0.6
Interest cost |  | 9.6 | 9.9 | 9.8
Expected return on plan assets |  | (12.3) | (11.9) | (12.3)
Amortization of net actuarial loss |  | 5.6 | 5.6 | 5.6
Settlements | [3] | 0.2 | 0.3 | 0.0
Curtailment gain | [3] | 0.0 | (0.3) | 0.0
Net periodic benefit cost |  | 3.6 | 4.1 | 3.7
Other changes in benefit obligation recognized in other comprehensive income (loss) [Abstract] |  |  |  |
Net actuarial loss |  | (7.7) | (5.8) | (1.0)
Amortization of net actuarial loss |  | 5.8 | 5.9 | 5.6
Total recognized in other comprehensive income (loss) |  | (1.9) | 0.1 | 4.6
Reversal of amortization items [Abstract] |  |  |  |
Estimated net actuarial loss that will be amortized |  | (6.0) |  |
Pension Plans [Member] | No-U.S Plans [Member] | Maximum [Member] |  |  |  |
Components of net periodic benefit cost [Abstract] |  |  |  |
Amortization of net actuarial loss |  | 1.0 | $ 1.0 | $ 1.0
Reversal of amortization items [Abstract] |  |  |  |
Estimated amortization in next fiscal year |  | $ 1.0 |  |
[1] | Represents net periodic benefit cost, exclusive of service cost, for the Company's pension and postretirement plans.
[2] | Amounts are included in the calculation of net periodic benefit cost for the Company's defined benefit plans, which include pension and other postretirement plans. See Note 18 for additional information about the Company's pension plans.
[3] | The settlement charges and curtailment gain resulted from activity associated with the Company's non-U.S. pension plans.

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