Equity - Narrative (Details) - USD ($) $ / shares in Units, $ in Millions				3 Months Ended		6 Months Ended
	Jun. 30, 2020	Apr. 20, 2020	Jun. 13, 2017	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019	Dec. 31, 2019	Mar. 31, 2019	Dec. 31, 2018	Mar. 31, 2018	Nov. 21, 2017
Class of Stock [Line Items]
Common stock authorized (shares)	450,000,000			450,000,000		450,000,000		450,000,000.0
Common stock, par value per share ($ per share)	$ 0.01			$ 0.01	$ 0.01	$ 0.01	$ 0.01	$ 0.01	$ 0.01	$ 0.01	$ 0.01
Common stock issued (shares)	144,408,052			144,408,052		144,408,052		143,600,000
Common Stock, Shares, Outstanding	144,400,000			144,400,000		144,400,000		143,600,000
Preferred stock authorized (shares)	50,000,000			50,000,000		50,000,000		50,000,000.0
Preferred stock, par value per share ($ per share)	$ 0.01			$ 0.01		$ 0.01
Series A Preferred Stock outstanding (shares)	400,000			400,000		400,000
Series A Preferred Stock Issued (shares)	400,000	400,000		400,000		400,000
Temporary Equity, Par or Stated Value Per Share		$ 0.01
Series A Preferred Stock dividend rate (%)				7.00%		7.00%
Dividend Period	12 months
Series A Preferred Stock terms of conversion	The Series A Preferred Stock is convertible at the option of any holder at any time into shares of our common stock at an initial conversion price of $16.00 per share and an initial conversion rate of 62.50 shares of our common stock per share of Series A Preferred Stock, subject to certain anti-dilution adjustments. The issuance of shares of our common stock upon the conversion of Series A Preferred Stock is subject to a cap equal to 28,856,239 shares of our common stock (the “Share Cap”), unless and until the Company obtains stockholder approval to the extent required for the issuance of additional shares. Any amounts owed above the Share Cap must be paid in cash.Subject to certain conditions, at the Company’s option, (i) after the third anniversary of the Closing Date, all of the Series A Preferred Stock may be converted into shares of our common stock, and (ii) after the seventh anniversary of the Closing Date, all of the Series A Preferred Stock may be redeemed for cash at a redemption price equal to 100% of the liquidation preference of the Series A Preferred Stock, plus any accrued and unpaid dividends. Subject to certain conditions, each holder of the Series A Preferred Stock, after a Change of Control (as defined in the Articles) may (i) require the Company to purchase any or all of their shares of Series A Preferred Stock at a redemption price payable in cash equal to 105% of the liquidation preference of the Series A Preferred Stock, plus any accrued and unpaid dividends, or (ii) convert any or all of their shares of Series A Preferred Stock into the number of shares of our common stock equal to the liquidation preference (including accrued and unpaid dividends) divided by the then-applicable conversion price.
Preferred Stock, Convertible, Conversion Price ($ per share)	$ 16.00			$ 16.00		$ 16.00
Convertible Preferred Stock, Common Shares Issuable (shares)	62.50			62.50		62.50
Redemption Price As A Percentage of Liquidation Preference	100.00%			100.00%		100.00%
Distributions to holders of Class A equity interests of a subsidiary						$ 61.1	$ 103.9
Maximum
Class of Stock [Line Items]
Dividend Percentage In Excess Of Required Distributions For A REIT						5.00%
Convertible Preferred Stock, Common Shares Issuable (shares)	28,856,239			28,856,239		28,856,239
At-The-Market Equity Offering Program
Class of Stock [Line Items]
ATM Program, authorized amount outstanding	$ 232.5			$ 232.5		$ 232.5						$ 300.0
Shares issued under the ATM Program (shares)				0		0
Noncontrolling Interest
Class of Stock [Line Items]
Distributions to holders of Class A equity interests of a subsidiary				$ 0.0	$ 0.5	$ 0.4	$ 1.1
Business Acquisition, Equity interest issued (shares)			1,953,407
Equity interests redeemed during the period (shares)						1,026,727
Series A Preferred Stock
Class of Stock [Line Items]
Issuance price ($ per share)		$ 1,000
Proceeds from Issuance or Sale of Equity		$ 400.0
Series A Preferred Stock Annual Dividend Rate Percentage Increase	0.75%			0.75%		0.75%
Convertible Preferred Stock, Common Shares Issuable (shares)	25,000,000.0			25,000,000.0		25,000,000.0
Redemption Price After Change Of Control As A Percentage of Liquidation Preference	105.00%			105.00%		105.00%
Distributions to holders of Class A equity interests of a subsidiary				$ 5.5