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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