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2. Acquisitions (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2019
Dec. 31, 2018
Mar. 04, 2019
Business Combinations [Abstract]      
Business Combination, Consideration Transferred $ 20.0    
Payments to Acquire Businesses, Net of Cash Acquired 16.0 $ 4.0  
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles     $ 12.0
Goodwill, Acquired During Period 10.7    
Business Combination, Consideration Transferred, Liabilities Incurred $ 2.7