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Business Combinations Breathe Acquisition (Details) - USD ($)
3 Months Ended 6 Months Ended
Oct. 01, 2018
Dec. 31, 2019
Mar. 31, 2020
Mar. 31, 2019
Sep. 30, 2019
Sep. 03, 2019
Business Acquisition [Line Items]            
Payments to Acquire Businesses, Gross $ 17,100,000   $ (13,100,000) $ 0    
Goodwill     $ 1,805,700,000   $ 1,800,900,000  
Professional Fees   $ 4,000,000.0        
Customer Relationships [Member] | Breathe [Member]            
Business Acquisition [Line Items]            
Intangible Assets           $ 400,000