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Summary of Significant Accounting Policies (Details) - USD ($) $ in Millions | 12 Months Ended
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Jun. 30, 2022 | Jun. 30, 2021 | Jun. 30, 2020
Summary Of Significant Accounting Policies [Line Items] |  |  |
Allowance for doubtful accounts receivable | $ 3.2 | $ 3.1 |
Amount of tax expense (benefit) for changes in the fair value of interest rate swap agreements | 11.8 | 4.5 | $ (8.7)
Accumulated other comprehensive loss related to foreign currency translation adjustments | (45.3) | (15.9) | (38.6)
Accumulated other comprehensive income (loss) related to fair value of interest rate swaps | 13.1 | (20.5) | (33.2)
Accumulated other comprehensive income (loss) related to unrecognized post-retirement plan costs | $ 1.1 | $ 0.1 | $ (0.5)
Equipment and furniture |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |
Estimated useful life | from three to eight years |  |
Leasehold improvements |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |
Estimated useful life | over the remaining lease term or the useful life of the improvements, whichever is shorter |  |

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- Definition Accumulated adjustment, net of tax, that results from the process of translating subsidiary financial statements and foreign equity investments into the reporting currency from the functional currency of the reporting entity, net of reclassification of realized foreign currency translation gains or losses. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 11 -URI https://asc.fasb.org/extlink&oid=126968391&loc=d3e637-108580 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14 -URI https://asc.fasb.org/extlink&oid=126968391&loc=d3e681-108580 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 45 -Paragraph 5A -URI https://asc.fasb.org/extlink&oid=123594809&loc=SL116692626-108610 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 10A -Subparagraph (a) -URI https://asc.fasb.org/extlink&oid=126968391&loc=SL7669646-108580 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI https://asc.fasb.org/extlink&oid=126968391&loc=SL7669686-108580 + Details
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