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Equity - Noncontrolling Interest (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Noncontrolling Interest        
Balance at December 31, 2016 and 2015, respectively     $ 7.6 $ 3.8
Net income (loss) attributable to noncontrolling interest $ 3.7 $ 1.8 7.7 4.3
Noncontrolling interest distributions     (4.8) (1.7)
Balance at June 30, 2017 and 2016, respectively $ 10.5 $ 6.4 $ 10.5 $ 6.4