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Condensed Consolidated Balance Sheets (Parenthetical) - USD ($)
$ in Millions
Mar. 31, 2017
Dec. 31, 2016
Statement of Financial Position [Abstract]    
Principal amount of loans payable $ 141.5 $ 144.4
Common stock, units issued (in shares) 85,818,358 84,610,951
Common stock, units outstanding (in shares) 85,818,358 84,610,951