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CMG Acquisitions - Components of Final Purchase Price Allocation (Details) - USD ($)
$ in Millions
Aug. 01, 2019
Dec. 31, 2019
Sep. 30, 2019
Dec. 31, 2018
Business Acquisition [Line Items]        
Goodwill   $ 3,482.9 $ 3,456.4 $ 3,154.8
CMG        
Business Acquisition [Line Items]        
Cash   0.3    
Accounts receivable   11.3    
Prepaid expenses and other current assets   1.1    
Property, plant and equipment   613.2    
Investment in Pennant   88.0    
Intangible assets   250.0    
Total assets acquired   963.9    
Accounts payable   3.3    
Other noncurrent liabilities   0.1    
Total liabilities assumed   3.4    
Goodwill   323.9    
Net consideration transferred (including preliminary working capital adjustments)   $ 1,284.4    
CMG | Customer Relationships        
Business Acquisition [Line Items]        
Average intangible amortization period 35 years