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Fair Value Measurements - Schedule of Fair Value of Financial Assets (Detail) - USD ($) $ in Millions | Dec. 31, 2016 | Jun. 30, 2016
--- | --- | ---
Fair Value, Option, Qualitative Disclosures Related to Election [Line Items] |  |  |
Total fair value of financial assets and liability |  | $ (204.3) | $ 162.4
Long-term Debt [Member] |  |  |
Fair Value, Option, Qualitative Disclosures Related to Election [Line Items] |  |  |
Total fair value of financial liability |  | (204.0) |
Contingent Consideration [Member] |  |  |
Fair Value, Option, Qualitative Disclosures Related to Election [Line Items] |  |  |
Total fair value of financial liability |  | (137.1) | (10.4)
Money Market Funds [Member] |  |  |
Fair Value, Option, Qualitative Disclosures Related to Election [Line Items] |  |  |
Total fair value of financial assets | [1] | 26.9 | 2.4
Corporate Bonds and Notes [Member] |  |  |
Fair Value, Option, Qualitative Disclosures Related to Election [Line Items] |  |  |
Total fair value of financial assets |  | 38.6 | 51.0
Municipal Bonds [Member] |  |  |
Fair Value, Option, Qualitative Disclosures Related to Election [Line Items] |  |  |
Total fair value of financial assets |  | 55.5 | 85.6
Federal Agency Issues [Member] |  |  |
Fair Value, Option, Qualitative Disclosures Related to Election [Line Items] |  |  |
Total fair value of financial assets |  | 12.5 | 25.5
US Government Securities [Member] |  |  |
Fair Value, Option, Qualitative Disclosures Related to Election [Line Items] |  |  |
Total fair value of financial assets |  | 3.3 | 8.3
Level 1 [Member] |  |  |
Fair Value, Option, Qualitative Disclosures Related to Election [Line Items] |  |  |
Total fair value of financial assets and liability |  | 26.9 | 2.4
Level 1 [Member] | Money Market Funds [Member] |  |  |
Fair Value, Option, Qualitative Disclosures Related to Election [Line Items] |  |  |
Total fair value of financial assets | [1] | 26.9 | 2.4
Level 2 [Member] |  |  |
Fair Value, Option, Qualitative Disclosures Related to Election [Line Items] |  |  |
Total fair value of financial assets and liability |  | 109.9 | 170.4
Level 2 [Member] | Corporate Bonds and Notes [Member] |  |  |
Fair Value, Option, Qualitative Disclosures Related to Election [Line Items] |  |  |
Total fair value of financial assets |  | 38.6 | 51.0
Level 2 [Member] | Municipal Bonds [Member] |  |  |
Fair Value, Option, Qualitative Disclosures Related to Election [Line Items] |  |  |
Total fair value of financial assets |  | 55.5 | 85.6
Level 2 [Member] | Federal Agency Issues [Member] |  |  |
Fair Value, Option, Qualitative Disclosures Related to Election [Line Items] |  |  |
Total fair value of financial assets |  | 12.5 | 25.5
Level 2 [Member] | US Government Securities [Member] |  |  |
Fair Value, Option, Qualitative Disclosures Related to Election [Line Items] |  |  |
Total fair value of financial assets |  | 3.3 | 8.3
Level 3 [Member] |  |  |
Fair Value, Option, Qualitative Disclosures Related to Election [Line Items] |  |  |
Total fair value of financial assets and liability |  | (341.1) | (10.4)
Level 3 [Member] | Long-term Debt [Member] |  |  |
Fair Value, Option, Qualitative Disclosures Related to Election [Line Items] |  |  |
Total fair value of financial liability |  | (204.0) |
Level 3 [Member] | Contingent Consideration [Member] |  |  |
Fair Value, Option, Qualitative Disclosures Related to Election [Line Items] |  |  |
Total fair value of financial liability |  | $ (137.1) | $ (10.4)
[1] | Money market funds are primarily comprised of exchange traded funds and accrued interest

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- Definition Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 + Details
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