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Summary of Preliminary Allocation of Fair Value of Assets Acquired and Liabilities Assumed at Date of Acquisition (Detail) - USD ($)
$ in Millions
Mar. 31, 2020
Dec. 31, 2019
Apr. 08, 2019
Business Acquisition [Line Items]      
Goodwill $ 542.6 $ 546.0  
Water-Right, Inc      
Business Acquisition [Line Items]      
Current assets, net of cash acquired     $ 9.7
Property, plant and equipment     8.6
Intangible assets     60.4
Goodwill     31.0
Total assets acquired     109.7
Current liabilities     (2.7)
Net assets acquired     $ 107.0