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Business Combinations - Estimated Fair Value of Assets Acquired (Details) - USD ($)
$ in Millions
Sep. 30, 2019
Apr. 01, 2019
Dec. 31, 2018
Business Acquisition [Line Items]      
Goodwill $ 3,338.3   $ 3,108.8
Mist      
Business Acquisition [Line Items]      
Cash and cash equivalents   $ 38.9  
Goodwill   228.9  
Intangible assets   102.0  
Other assets acquired   15.8  
Liabilities assumed   (26.4)  
Total   $ 359.2