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Dispositions and Assets Held for Sale (Narrative) (Details) - USD ($)
$ in Millions
9 Months Ended
Aug. 31, 2018
Sep. 30, 2018
Sep. 30, 2017
Apr. 16, 2018
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Gain recognized on sale   $ 267.2 $ 0.0  
Held-for-sale        
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Property and equipment, net   115.4    
Oncology | Disposal Group        
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Agreement consideration       $ 2,400.0
Gain recognized on sale $ 267.2      
Integration and acquisition costs | Held-for-sale        
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Impairment charges   $ 145.4