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CMG Acquisitions - Components of Final Purchase Price Allocation (Details) - USD ($) $ in Millions | Aug. 01, 2019 | Mar. 31, 2020 | Sep. 30, 2019 | Mar. 31, 2019
--- | --- | --- | --- | ---
Business Acquisition [Line Items] |  |  |  |
Goodwill |  | $ 3,465.5 | $ 3,456.4 | $ 3,147.8
CMG |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Cash | $ 0.3 |  |  |
Accounts receivable | 10.2 |  |  |
Prepaid expenses and other current assets | 1.1 |  |  |
Property, plant and equipment | 613.6 |  |  |
Investment in Pennant | 88.0 |  |  |
Intangible assets | 250.0 |  |  |
Total assets acquired | 963.2 |  |  |
Accounts payable | 3.3 |  |  |
Other noncurrent liabilities | 0.1 |  |  |
Total liabilities assumed | 3.4 |  |  |
Goodwill | 324.6 |  |  |
Net consideration transferred (including working capital adjustments) | $ 1,284.4 |  |  |
CMG | Customer Relationships |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Average intangible amortization period | 35 years |  |  |

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