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Income Taxes (Tables) | 6 Months Ended
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Sep. 30, 2018
Income Tax Disclosure [Abstract] |
Summary of unrecognized tax benefits | The following tables summarize the activity related to the Company’s gross unrecognized tax benefits for the six months ended September 30, 2018 and the year ended March 31, 2018 (in millions):
| Six Months Ended September 30, 2018
Balance at March 31, 2018 | $ | 436.0 |
Increases related to acquisitions | 284.0 |
Decreases related to settlements with tax authorities | — |
Decreases related to statute of limitation expirations | (11.3 | )
Increases related to current year tax positions | 23.2 |
Decreases related to prior year tax positions | (50.1 | )
Balance at September 30, 2018 | $ | 681.8 |
| Year Ended March 31, 2018
Balance at March 31, 2017 | $ | 398.5 |
Increases related to acquisitions | — |
Decreases related to settlements with tax authorities | (0.1 | )
Decreases related to statute of limitation expirations | (10.9 | )
Increases related to current year tax positions | 30.3 |
Increases related to prior year tax positions | 18.2 |
Balance at March 31, 2018 | $ | 436.0 |

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- Definition Tabular disclosure for tax positions taken in the tax returns filed or to be filed for which it is more likely than not that the tax position will not be sustained upon examination by taxing authorities and other income tax contingencies. Includes, but is not limited to, interest and penalties, reconciliation of unrecognized tax benefits, unrecognized tax benefits that would affect the effective tax rate, tax years that remain subject to examination by tax jurisdictions, and information about positions for which it is reasonably possible that amounts unrecognized will significantly change within 12 months. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15A -URI http://asc.fasb.org/extlink&oid=84230637&loc=SL6600010-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32718-109319 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 19 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32840-109319 + Details
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