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Acquisitions - Allocation of Consideration Transferred (Detail) - USD ($) $ in Millions |  |  | 9 Months Ended |  |
--- | --- | --- | --- | --- | ---
Sep. 30, 2017 | Aug. 31, 2016 | Mar. 31, 2017 | Mar. 31, 2018 | Jun. 30, 2017
Business Acquisition [Line Items] |  |  |  |  |
Goodwill |  |  |  | $ 320.2 | $ 316.1
Total cash consideration transferred |  |  | $ 216.1 |  |
Assurex [Member] |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Current assets | $ 18.2 |  |  |  |
Intangible assets | 295.6 |  |  |  |
Equipment | 1.9 |  |  |  |
Goodwill | 121.1 |  |  | $ 121.1 | $ 119.2
Current liabilities | (18.9) |  |  |  |
Deferred tax liability | (66.3) |  |  |  |
Total fair value purchase price | 351.6 | $ 351.6 |  |  |
Less: Contingent consideration | (130.0) | (130.0) |  |  |
Less: Cash acquired | $ (5.5) |  |  |  |
Total cash consideration transferred |  | $ 216.1 |  |  |

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- Definition Amount of liability recognized arising from contingent consideration in a business combination. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=35744584&loc=d3e6927-128479 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 35 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6911338&loc=d3e6819-128478 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 25 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6911189&loc=d3e6408-128476 + Details
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- Definition Amount of assets that are expected to be realized or consumed within one year or the normal operating cycle, if longer, acquired at the acquisition date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=84161108&loc=d3e4845-128472 + Details
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- Definition Amount of deferred tax liability attributable to taxable temporary difference assumed at the acquisition date that are classified as noncurrent. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=84161108&loc=d3e4845-128472 + Details
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- Definition Amount of tangible personal property used to produce goods and services, including, but is not limited to, tools, dies and molds, computer and office equipment, acquired at the acquisition date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=84161108&loc=d3e4845-128472 + Details
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