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Acquisitions and Discontinued Operations Acquisitions (Details) - USD ($)
$ in Millions
1 Months Ended 6 Months Ended
Feb. 28, 2019
Jun. 30, 2019
Jun. 30, 2018
Dec. 31, 2018
Business Acquisition [Line Items]        
Acquisitions, net of cash acquired   $ 284.5 $ 0.9  
Goodwill   $ 2,287.5   $ 2,072.7
Aquion        
Business Acquisition [Line Items]        
Acquisitions, net of cash acquired $ 163.4      
Goodwill 93.9      
Indefinite-lived trade name intangible assets 15.7      
Definite-lived customer relationships $ 78.8      
Estimated useful life 15 years      
Pelican        
Business Acquisition [Line Items]        
Acquisitions, net of cash acquired $ 121.1      
Goodwill $ 121.0