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v3.19.2

General (Details) - USD ($) $ in Millions | Jun. 30, 2019 | Mar. 31, 2019 | Mar. 31, 2018
--- | --- | --- | ---
Leases [Abstract] |  |  |
Right-of-use assets | $ 64.9 | $ 61.3 |
Operating lease liabilities, Other current liabilities | 12.9 |  |
Operating lease liabilities, Other noncurrent liabilities | 50.7 |  |
Operating leases, right-of-use liabilitiess | 63.6 |  |
New Accounting Guidance Adopted [Abstract] |  |  |
Retained earnings | 480.1 | 472.1 |
Real Estate Leases [Member] |  |  |
Leases [Abstract] |  |  |
Right-of-use assets |  | 61.3 |
Operating lease liabilities, Other current liabilities |  | 12.4 |
Operating lease liabilities, Other noncurrent liabilities |  | 48.9 |
Build to Suit Arrangements [Member] |  |  |
Leases [Abstract] |  |  |
Right-of-use assets |  | $ 5.2 |
Operating leases, right-of-use liabilitiess | $ 5.2 |  |
ASU 2014-09 [Member] |  |  |
New Accounting Guidance Adopted [Abstract] |  |  |
Retained earnings |  |  | $ 0.7
ASU 2016-16 [Member] |  |  |
New Accounting Guidance Adopted [Abstract] |  |  |
Retained earnings |  |  | $ (8.3)

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