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Acquisitions - Purchase Price Allocation (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Mar. 31, 2020
Jun. 30, 2020
Jun. 30, 2019
Business Acquisition [Line Items]      
Cash paid for acquisition of business   $ 130.6 $ 0.0
Universal Weather and Aviation, Inc.      
Business Acquisition [Line Items]      
Cash paid for acquisition of business $ 128.6    
Amounts due to sellers 30.0 $ 38.9  
Estimated purchase price 158.6    
Assets acquired:      
Accounts receivable 42.8    
Goodwill and identifiable intangible assets 123.0    
Other current and long-term assets 3.8    
Liabilities assumed:      
Accounts payable (9.9)    
Other current and long-term liabilities (1.0)    
Estimated purchase price $ 158.6