Share-Based Payments and Employee Benefits - OP Units (Details) - OP Units - USD ($) $ / shares in Units, $ in Millions		12 Months Ended
	Jul. 18, 2017	Dec. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Additional Disclosures [Abstract]
Equity grants (in shares)	3,300,000	3,280,900
Portion of consideration attributable to performance of future services	$ 110.6
Shares
Beginning balance (in shares)		0
Granted (in shares)	3,300,000	3,280,900
Vested in period (in shares)		(193,938)
Ending balance (in shares)		3,086,962
Weighted Average Grant-Date Fair Value
Beginning balance (in dollars per share)		$ 0.00
Granted (in dollars per share)		33.71
Vested (in dollars per share)		37.10
Ending balance (in dollars per share)		$ 33.49
Minimum
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Additional Disclosures [Abstract]
Vesting period	12 months
Expected volatility rate	18.00%
Risk-free interest rate	1.30%
Expected life (in years)	1 year
Maximum
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Additional Disclosures [Abstract]
Vesting period	60 months
Expected volatility rate	27.00%
Risk-free interest rate	1.50%
Expected life (in years)	3 years