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Share-Based Payments - Narrative (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Millions | 1 Months Ended | 3 Months Ended | 9 Months Ended
--- | --- | --- | ---
Nov. 30, 2018 | Nov. 30, 2017 | Nov. 30, 2016 | Nov. 30, 2015 | Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018
ParentCo |  |  |  |  |  |  |  |
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] |  |  |  |  |  |  |  |
Closing stock price (in dollars per share) | $ 60.25 | $ 44.20 | $ 43.84 | $ 37.34 |  |  |  |
Selling, General and Administrative Expenses |  |  |  |  |  |  |  |
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] |  |  |  |  |  |  |  |
Share-based compensation cost |  |  |  |  | $ 6.7 | $ 7.0 | $ 20.8 | $ 21.0
Key Employees | Restricted Stock Equivalents | ParentCo |  |  |  |  |  |  |  |
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] |  |  |  |  |  |  |  |
RSE awards granted, shares | 73 | 100 | 92 | 106 |  |  |  |
Vesting period, years | 4 years | 4 years | 4 years | 4 years |  |  |  |
Key Employees | Performance Shares |  |  |  |  |  |  |  |
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] |  |  |  |  |  |  |  |
Maximum award payout (in shares) | 380 | 476 | 498 |  |  |  |  |
Key Executives | Restricted Stock Equivalents | ParentCo |  |  |  |  |  |  |  |
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] |  |  |  |  |  |  |  |
RSE awards granted, shares | 55 | 68 | 73 |  |  |  |  |
Key Employees and Key Executives | Performance Shares |  |  |  |  |  |  |  |
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] |  |  |  |  |  |  |  |
RSE awards granted, shares | 190 | 238 | 249 |  |  |  |  |
Vesting period, years | 3 years | 3 years | 3 years |  |  |  |  |

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- Definition Period over which grantee's right to exercise award under share-based payment arrangement is no longer contingent on satisfaction of service or performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Includes, but is not limited to, combination of market, performance or service condition. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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