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Debt - Components of Debt (Details) - USD ($)	1 Months Ended		12 Months Ended
Debt - Components of Debt (Details) - USD ($)	Feb. 28, 2021	Dec. 31, 2020	Dec. 31, 2020	Feb. 09, 2021	Jun. 29, 2020	Dec. 31, 2019
Debt Instrument [Line Items]
Debt		$ 2,415,000,000	$ 2,415,000,000
Deferred financing costs, net		134,529,000	134,529,000
Total debt		2,280,471,000	2,280,471,000			$ 2,229,220,000
Unsecured debt \| Revolving credit facilities
Debt Instrument [Line Items]
Debt		40,000,000	40,000,000			165,000,000
Unsecured debt \| Revolving credit facilities \| Senior unsecured credit facility
Debt Instrument [Line Items]
Debt		40,000,000.0	40,000,000.0			165,000,000
Repayments of long-term debt		250,000,000.0	250,000,000.0
Unsecured debt \| Revolving credit facilities \| PHL unsecured credit facility
Debt Instrument [Line Items]
Debt		0	0			0
Unsecured debt \| Unsecured term loans
Debt Instrument [Line Items]
Debt		1,775,000,000	1,775,000,000			1,975,000,000
Deferred financing costs, net		(8,455,000)	(8,455,000)			(10,343,000)
Total debt		1,766,545,000	1,766,545,000			1,964,657,000
Borrowings, fixed interest rate		$ 1,400,000,000	$ 1,400,000,000			$ 1,600,000,000
Weighted-average fixed interest rate		4.19%	4.19%			3.43%
Amount of debt bearing variable interest		$ 345,000,000.0	$ 345,000,000.0			$ 345,000,000.0
Weighted-average floating interest rate		2.46%	2.46%			3.32%
Repayments of long-term debt		$ 200,000,000.0
Unsecured debt \| Unsecured term loans \| First Term Loan
Debt Instrument [Line Items]
Debt		300,000,000	$ 300,000,000			$ 300,000,000
Unsecured debt \| Unsecured term loans \| Second Term Loan
Debt Instrument [Line Items]
Debt		65,000,000	65,000,000			65,000,000
Unsecured debt \| Unsecured term loans \| Fourth Term Loan
Debt Instrument [Line Items]
Debt		110,000,000	110,000,000			110,000,000
Unsecured debt \| Unsecured term loans \| Sixth Term Loan
Debt Instrument [Line Items]
Debt		1,300,000,000	1,300,000,000			1,500,000,000
Unsecured debt \| Unsecured term loans \| Tranche 2021
Debt Instrument [Line Items]
Debt		40,966,000	40,966,000			300,000,000
Unsecured debt \| Unsecured term loans \| Tranche 2021 \| Subsequent event
Debt Instrument [Line Items]
Repayments of long-term debt	$ 12,800,000
Unsecured debt \| Unsecured term loans \| Tranche 2021 Extended
Debt Instrument [Line Items]
Debt		173,034,000	173,034,000		$ 242,600,000	0
Unsecured debt \| Unsecured term loans \| Tranche 2022
Debt Instrument [Line Items]
Debt		286,000,000	286,000,000			400,000,000
Unsecured debt \| Unsecured term loans \| Tranche 2023
Debt Instrument [Line Items]
Debt		400,000,000	400,000,000			400,000,000
Unsecured debt \| Unsecured term loans \| Tranche 2024
Debt Instrument [Line Items]
Debt		$ 400,000,000	$ 400,000,000			400,000,000
Convertible debt
Debt Instrument [Line Items]
Interest Rate		1.75%	1.75%
Debt		$ 500,000,000	$ 500,000,000			0
Debt discount, net		(113,099,000)	(113,099,000)			0
Deferred financing costs, net		12,568,000	12,568,000			0
Total debt		374,333,000	374,333,000			0
Convertible debt \| Subsequent event
Debt Instrument [Line Items]
Interest Rate				1.75%
Senior unsecured notes
Debt Instrument [Line Items]
Debt		100,000,000	100,000,000			100,000,000
Deferred financing costs, net		(407,000)	(407,000)			(437,000)
Total debt		$ 99,593,000	$ 99,593,000			99,563,000
Senior unsecured notes \| Series A Notes
Debt Instrument [Line Items]
Interest Rate		4.70%	4.70%
Debt		$ 60,000,000	$ 60,000,000			60,000,000
Senior unsecured notes \| Series B Notes
Debt Instrument [Line Items]
Interest Rate		4.93%	4.93%
Debt		$ 40,000,000	$ 40,000,000			$ 40,000,000