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Share-Based Compensation - Employee Stock Purchase Plan (Details) - USD ($) $ in Millions | 12 Months Ended
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Mar. 31, 2020 | Mar. 31, 2019 | Mar. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Total compensation cost not yet recognized | $ 263.2 |  |
Restricted stock units' weighted average remaining expense recognition period (in years) | 2 years 10 days |  |
Employee Stock Purchase Plans |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Share based compensation arrangement by share based payment award, market price offering date percentage | 85.00% |  |
Common stock, capital shares reserved for future issuance (in shares) | 16,289,436 |  |
Share-based compensation arrangement by share-based payment award, number of shares available for grant (in shares) | 6,347,253 |  |
Stock issued during period, shares, employee stock purchase plans (in shares) | 787,284 | 549,796 | 828,015
Stock issued during period, value, employee stock purchase plan | $ 55.6 | $ 39.6 | $ 38.2
Total compensation cost not yet recognized | $ 5.8 |  |
Restricted stock units' weighted average remaining expense recognition period (in years) | 5 months |  |

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- Definition Weighted-average period over which cost not yet recognized is expected to be recognized for award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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- Definition The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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