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Significant Accounting Policies, Leases (Details) $ in Millions | Mar. 31, 2021 USD ($) | Mar. 31, 2020 USD ($) | Mar. 31, 2019 USD ($) Lease
--- | --- | --- | ---
Leases [Abstract] |  |  |
Right-of-use assets | $ 54.1 | $ 61.4 |
Operating lease liabilities, current | $ 11.2 | $ 10.9 |
Operating lease liabilities, current, Statement of Financial Position [Extensible List] | Other Liabilities, Current | Other Liabilities, Current |
Operating lease liabilities, noncurrent | $ 44.8 | $ 50.3 |
Operating lease liabilities, noncurrent, Statement of Financial Position [Extensible List] | Other Liabilities, Noncurrent | Other Liabilities, Noncurrent |
Operating lease liabilities | $ 56.0 |  |
Lease Accounting Guidance [Member] |  |  |
Leases [Abstract] |  |  |
Right-of-use assets |  |  | $ 61.3
Operating lease liabilities, current |  |  | $ 12.4
Operating lease liabilities, current, Statement of Financial Position [Extensible List] |  |  | Other Liabilities, Current
Operating lease liabilities, noncurrent |  |  | $ 48.9
Operating lease liabilities, noncurrent, Statement of Financial Position [Extensible List] |  |  | Other Liabilities, Noncurrent
Lease Accounting Guidance [Member] | Build-to-Suit Arrangements [Member] |  |  |
Leases [Abstract] |  |  |
Right-of-use assets |  |  | $ 5.2
Operating lease liabilities |  |  | $ 5.2
Number of operating leases | Lease |  |  | 2

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- Definition Present value of lessee's discounted obligation for lease payments from operating lease. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 45 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121603541&loc=SL77918627-209977 + Details
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