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ACQUISITIONS - Schedule of Recognized Identified Assets Acquired and Liabilities Assumed (Details) - USD ($)
$ in Millions
Jan. 03, 2020
Mar. 31, 2021
Dec. 31, 2020
ASSETS      
Goodwill   $ 181.3 $ 136.1
Ad Astra      
ASSETS      
Cash and cash equivalents $ 3.4    
Accounts receivable 0.5    
Property and equipment 0.4    
Intangible assets 1.1    
Goodwill 14.8    
Operating lease asset 0.2    
Total assets 20.4    
Liabilities      
Accounts payable and accrued liabilities 2.3    
Operating lease liabilities 0.2    
Total liabilities 2.5    
Total cash consideration transferred $ 17.9