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Equity - Noncontrolling Interests (Details) - USD ($)
$ in Millions
Jun. 30, 2018
Dec. 31, 2017
Noncontrolling Interest [Line Items]    
Noncontrolling interests $ 179.4 $ 211.9
Noncontrolling Interest [Member]    
Noncontrolling Interest [Line Items]    
Noncontrolling interests $ 179.4 $ 211.9