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Pensions (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019
Net Periodic Benefit Cost [Abstract] |  |  |  |  |
Net periodic benefit cost | [1] | $ 0.7 | $ 0.7 | $ 1.5 | $ 1.4
Pension [Member] |  |  |  |  |
Net Periodic Benefit Cost [Abstract] |  |  |  |  |
Service cost |  | 0.1 | 0.1 | 0.2 | 0.2
Interest cost |  | 1.9 | 2.2 | 3.9 | 4.5
Expected return on plan assets |  | (2.8) | (2.9) | (5.7) | (5.9)
Amortization of unrecognized net loss |  | 1.8 | 1.5 | 3.5 | 3.0
Net periodic benefit cost |  | 1.0 | $ 0.9 | 1.9 | 1.8
Pension [Member] | United States [Member] |  |  |  |  |
Employer Contributions [Abstract] |  |  |  |  |
Employer contributions |  |  |  | 0.0 | $ 1.7
Employer contributions expected to be contributed during fiscal 2021 |  | $ 20.0 |  | $ 20.0 |
[1] | Net periodic benefit cost for the Company’s pension and postretirement plans is exclusive of service cost.

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