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Business Acquisitions, Investments and Restructuring Charges (Investments) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Investment [Line Items]    
Proceeds from noncontrolling equity interest $ 35.8 $ 27.4
Other Noncurrent Assets    
Investment [Line Items]    
Payments to acquire non-controlling interest in solar energy facility $ 82.0 $ 29.0