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Income Taxes - Narrative (Details) - USD ($) $ / shares in Units, $ in Millions | 6 Months Ended | 12 Months Ended |
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Sep. 30, 2017 | Mar. 31, 2018 | Sep. 30, 2018
Income Tax Disclosure [Abstract] |  |  |
Effective income tax rate (benefit) | (2.10%) |  |
Interest on income taxes accrued |  | $ 12.9 | $ 38.9
Interest on income taxes accrued, acquisitions |  |  | 23.2
Income tax penalties accrued |  | 67.9 | 56.5
Penalties on income taxes accrued, acquisitions |  |  | $ 15.8
Tax Cuts and Jobs Act of 2017, transition tax for accumulated foreign earnings |  | $ 471.6 |
Tax Cuts and Jobs Act of 2017, provisional income tax expense (benefit), effect of change on earnings per share, diluted |  | $ (1.89) |

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- Definition Unrecognized Tax Benefits, Interest on Income Taxes Accrued, Acquisitions + References No definition available. + Details
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- Definition Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32698-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(h)(2)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32687-109319 + Details
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- Definition Amount of statutory penalties accrued for a tax position claimed or expected to be claimed by the entity, in its tax return. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32718-109319 + Details
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- Definition Amount of interest expense accrued for an underpayment of income taxes. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32718-109319 + Details
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