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Leases (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2019 | Mar. 31, 2019 | Mar. 31, 2018
Lease Assets [Abstract] |  |  |  |
Right-of-use assets |  | $ 64.9 | $ 61.3 |
Finance lease ROU assets, Property, plant and equipment - net | [1] | 8.8 |  |
Lease Liabilities [Abstract] |  |  |  |
Operating lease liabilities, Other current liabilities |  | 12.9 |  |
Operating lease liabilities, Other noncurrent liabilities |  | 50.7 |  |
Finance lease liabilities, Long-term debt - current portion |  | 0.3 |  |
Finance lease liabilities, Long-term debt |  | 3.6 |  |
Accumulated amortization |  | 1.4 |  |
Components of Lease Expense [Abstract] |  |  |  |
Operating lease expense | [2] | 5.2 |  |
Finance lease expense [Abstract] |  |  |  |
Depreciation of ROU assets |  | 0.1 |  |
Interest on lease liabilities |  | 0.0 |  |
Total lease expense |  | 5.3 |  |
Short-term lease expense |  | 0.9 |  |
Cash paid for amounts included in measurement of lease liabilities [Abstract] |  |  |  |
Operating cash flows for operating leases |  | 3.7 |  |
Financing cash flows for finance leases |  | 0.1 |  |
ROU assets obtained in exchange for lease liabilities [Abstract] |  |  |  |
Operating leases |  | 0.3 |  |
Finance leases |  | $ 0.0 |  |
Weighted-average remaining lease term [Abstract] |  |  |  |
Operating leases |  | 8 years 10 months 24 days |  |
Finance leases |  | 9 years 8 months 12 days |  |
Weighted-average discount rate [Abstract] |  |  |  |
Operating leases |  | 3.40% |  |
Finance leases |  | 2.00% |  |
Maturity of Operating Lease Liabilities [Abstract] |  |  |  |
Remainder of fiscal 2020 |  | $ 11.4 |  |
2021 |  | 13.4 |  |
2022 |  | 9.9 |  |
2023 |  | 8.0 |  |
2024 |  | 5.5 |  |
2025 and beyond |  | 24.8 |  |
Total lease payments |  | 73.0 |  |
Less: Interest |  | (9.4) |  |
Present value of lease liabilities |  | 63.6 |  |
Maturities of Finance Lease Liabilities [Abstract] |  |  |  |
Remainder of fiscal 2020 |  | 0.4 |  |
2021 |  | 0.5 |  |
2022 |  | 0.5 |  |
2023 |  | 0.5 |  |
2024 |  | 0.5 |  |
2025 and beyond |  | 2.5 |  |
Total lease payments |  | 4.9 |  |
Less: Interest |  | (1.0) |  |
Present value of lease liabilities |  | $ 3.9 |  |
Future minimum rental commitments under non-cancelable operating leases [Abstract] |  |  |  |
2020 |  |  | 14.2 |
2021 |  |  | 12.4 |
2022 |  |  | 9.1 |
2023 |  |  | 7.1 |
2024 |  |  | 4.7 |
2025 and beyond |  |  | 22.9 |
Total future minimum rental commitments |  |  | 70.4 |
Rental expense |  |  | $ 19.3 | $ 18.5
Minimum [Member] |  |  |  |
Significant Accounting Policy [Abstract] |  |  |  |
Remaining lease term |  | 1 year |  |
Maximum [Member] |  |  |  |
Significant Accounting Policy [Abstract] |  |  |  |
Remaining lease term |  | 11 years |  |
CIS [Member] |  |  |  |
Maturity of Operating Lease Liabilities [Abstract] |  |  |  |
Total lease payments |  | $ 7.0 |  |
Operating lease term |  | 15 years |  |
[1] | Finance lease ROU assets are recorded net of accumulated amortization of $1.4 million as of June 30, 2019.
[2] | For the three months ended June 30, 2019, operating lease expense included $0.9 million of short-term lease expense. Variable lease expense was not significant.

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