Debt - Narrative (Details) - USD ($)		12 Months Ended
	Nov. 29, 2019	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Line of Credit Facility [Line Items]
Debt outstanding		$ 2,240,000,000
Letters of credit outstanding		2,800,000	$ 0
Repayments of debt		518,207,000	102,366,000	$ 72,317,000
Estimated fair value of debt		101,200,000	164,300,000
Unrealized gain (loss) on derivative instruments		(26,045,000)	(2,907,000)	6,001,000
Interest rate swaps
Line of Credit Facility [Line Items]
Derivative instruments, asset position, fair value		3,400,000
Derivative instruments, liability position, fair value		20,500,000
Unrealized gain (loss) on derivative instruments		(26,000,000.0)	(2,900,000)
Expected reclassifications in next 12 months		11,500,000
Interest rate swaps | Interest expense
Line of Credit Facility [Line Items]
Reclassification of gain (loss) from AOCI to interest expense		6,400,000	700,000	$ 3,400,000
Letters of credit
Line of Credit Facility [Line Items]
Maximum borrowing capacity		30,000,000.0
Unsecured debt | Unsecured term loans
Line of Credit Facility [Line Items]
Borrowings, fixed interest rate		$ 1,600,000,000	$ 1,200,000,000
Weighted-average fixed interest rate		3.43%	3.46%
Borrowings, floating interest rate		$ 345,000,000.0	$ 1,200,000,000
Weighted-average floating interest rate		3.32%	4.26%
Debt outstanding		$ 1,975,000,000	$ 2,425,000,000
Repayments of debt		450,000,000.0
Unsecured debt | Revolving credit facilities
Line of Credit Facility [Line Items]
Debt outstanding		165,000,000	170,000,000
Unsecured debt | Senior unsecured credit facility | Revolving credit facilities
Line of Credit Facility [Line Items]
Maximum borrowing capacity		650,000,000.0
Debt outstanding		165,000,000	170,000,000
Remaining borrowing capacity		482,200,000
Maximum borrowing capacity potential increase (up to)		$ 1,300,000,000
Unsecured debt | Senior unsecured credit facility | Revolving credit facilities | Minimum
Line of Credit Facility [Line Items]
Unused commitment fee annual rate		0.20%
Unsecured debt | Senior unsecured credit facility | Revolving credit facilities | Minimum | LIBOR
Line of Credit Facility [Line Items]
Credit facility borrowings LIBOR rate plus		1.45%
Unsecured debt | Senior unsecured credit facility | Revolving credit facilities | Maximum
Line of Credit Facility [Line Items]
Unused commitment fee annual rate		0.30%
Unsecured debt | Senior unsecured credit facility | Revolving credit facilities | Maximum | LIBOR
Line of Credit Facility [Line Items]
Credit facility borrowings LIBOR rate plus		2.25%
Unsecured debt | PHL unsecured credit facility | Revolving credit facilities
Line of Credit Facility [Line Items]
Maximum borrowing capacity		$ 25,000,000.0
Debt outstanding		0	0
Remaining borrowing capacity		$ 25,000,000.0
Unsecured debt | PHL unsecured credit facility | Revolving credit facilities | Minimum | LIBOR
Line of Credit Facility [Line Items]
Credit facility borrowings LIBOR rate plus		1.45%
Unsecured debt | PHL unsecured credit facility | Revolving credit facilities | Maximum | LIBOR
Line of Credit Facility [Line Items]
Credit facility borrowings LIBOR rate plus		2.25%
Unsecured debt | Third Term Loan | Unsecured term loans
Line of Credit Facility [Line Items]
Debt outstanding		$ 0	200,000,000
Repayments of debt		200,000,000.0
Unsecured debt | Sixth Term Loan - tranche maturing 2020 | Unsecured term loans
Line of Credit Facility [Line Items]
Debt outstanding		0	250,000,000
Repayments of debt		250,000,000.0
Senior unsecured notes
Line of Credit Facility [Line Items]
Debt outstanding		100,000,000	100,000,000
Senior unsecured notes | Series A Notes
Line of Credit Facility [Line Items]
Debt outstanding		$ 60,000,000	60,000,000
Stated interest rate		4.70%
Senior unsecured notes | Series B Notes
Line of Credit Facility [Line Items]
Debt outstanding		$ 40,000,000	40,000,000
Stated interest rate		4.93%
Mortgage loans
Line of Credit Facility [Line Items]
Debt outstanding		$ 0	68,207,000
Repayments of debt	$ 65,400,000
Stated interest rate		3.69%
Cash flow hedging | Designated as hedging instrument | Interest rate swap, not yet effective
Line of Credit Facility [Line Items]
Notional value		$ 590,000,000.0
Cash flow hedging | Designated as hedging instrument | Interest rate swaps
Line of Credit Facility [Line Items]
Notional value		$ 1,630,000,000	$ 1,247,500,000