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Income Taxes - Unrecognized Tax Benefits (Details) - USD ($) $ in Millions | 12 Months Ended
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Mar. 31, 2020 | Mar. 31, 2019 | Mar. 31, 2018
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward] |  |  |
Beginning balance | $ 763.4 | $ 436.0 | $ 398.5
Increases related to acquisitions | 0.0 | 329.7 | 0.0
Decreases related to settlements with tax authorities | (1.2) | (8.3) | (0.1)
Decreases related to statute of limitation expirations | (30.9) | (16.2) | (10.9)
Increases related to current year tax positions | 30.2 | 27.8 | 30.3
Decreases related to prior year tax positions | (4.2) | (5.6) |
Increases related to prior year tax positions |  |  | 18.2
Ending balance | $ 757.3 | $ 763.4 | $ 436.0

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- Definition Amount of unrecognized tax benefits. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 45 -Paragraph 10B -URI http://asc.fasb.org/extlink&oid=116821951&loc=SL37586934-109318 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15A -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=84230637&loc=SL6600010-109319 + Details
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