Annual report pursuant to Section 13 and 15(d)

Summary of Significant Accounting Policies - Revenue Recognition (Details)

v3.8.0.1
Summary of Significant Accounting Policies - Revenue Recognition (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Accounting Policies [Abstract]    
Straight-line rent adjustments $ 51.9 $ 46.8