Subsequent Events	9 Months Ended
Sep. 30, 2018
Subsequent Events [Abstract]
Subsequent Events	Subsequent Events On October 24, 2018, we refinanced our global revolving credit facility and entered into a global senior credit agreement for a $2.35 billion senior unsecured revolving credit facility, which we refer to as the 2018 global revolving credit facility, that replaced the $2.0 billion revolving credit facility executed on January 15, 2016. The 2018 global revolving credit facility provides for borrowings in Australian dollars, British pounds sterling, Canadian dollars, Euros, Hong Kong dollars, Japanese yen, Singapore dollars, and U.S. dollars, and includes the ability to add additional currencies in the future. The 2018 global revolving credit facility matures on January 24, 2023 with two six-month extension options. In addition, we have the ability from time to time to increase the size of the global revolving credit facility and the unsecured term loans (discussed below), in any combination, by up to $1.25 billion, subject to receipt of lender commitments and other conditions precedent. On October 24, 2018, we refinanced our senior unsecured multi-currency term loan facility and entered into an amended and restated term loan agreement, which we refer to as the 2018 term loan agreement, which governs (i) a $300.0 million 5-year senior unsecured term loan, which we refer to as the 2023 Term Loan and (ii) an approximately $512.0 million 5-year senior unsecured term loan, which we refer to as the 2024 Term Loan. The 2018 term loan agreement replaced the $1.55 billion term loan agreement executed on January 15, 2016. The 2018 term loan agreement provides for borrowings in Australian dollars, Canadian dollars, Hong Kong dollars, Singapore dollars and U.S. dollars. In addition, we have the ability from time to time to increase the aggregate size of lending under the 2018 term loan agreement and the global revolving credit facility (discussed above), in any combination, by up to $1.25 billion, subject to receipt of lender commitments and other conditions precedent. The maturity date of the 2023 Term Loan is January 15, 2023. The maturity date of the 2024 Term Loan is January 24, 2023 with two six-month extension options. On October 24, 2018, we entered into a credit agreement for a ¥33.3 billion (approximately $296.5 million based on the exchange rate on October 24, 2018) senior unsecured revolving credit facility, which we refer to as the Yen revolving credit facility. The Yen revolving credit facility provides for borrowings in Japanese yen. In addition, we have the ability from time to time to increase the size of the Yen revolving credit facility to up to ¥93.3 billion (approximately $831.1 million based on the exchange rate on October 24, 2018), subject to receipt of lender commitments and other conditions precedent. The Yen revolving credit facility matures on January 24, 2024. On October 24, 2018, the Operating Partnership, together with its subsidiary Quill Equity LLC as borrowers, entered into Amendment No. 1 to the Senior Secured Term Loan, which we refer to (as so amended) as the secured term loan agreement, which among other things amended the financial covenants therein to correspond with the financial covenants in the 2018 global senior credit agreement and the 2018 term loan agreement, decreased the applicable rate for eurodollar rate advances, and decreased the applicable rate for base rate advances. As of October 24, 2018, the applicable rate for eurodollar rate advances is the applicable index plus 100 basis points and the applicable rate for base rate advances is the applicable index plus 0 basis points. An annual agency fee is payable quarterly in respect of the commitments under the secured term loan agreement. We are also required to pay certain fees to the administrative agent under the secured term loan agreement.

Subsequent Events

On October 24, 2018, we refinanced our global revolving credit facility and entered into a global senior credit agreement for a $2.35 billion senior unsecured revolving credit facility, which we refer to as the 2018 global revolving credit facility, that replaced the $2.0 billion revolving credit facility executed on January 15, 2016. The 2018 global revolving credit facility provides for borrowings in Australian dollars, British pounds sterling, Canadian dollars, Euros, Hong Kong dollars, Japanese yen, Singapore dollars, and U.S. dollars, and includes the ability to add additional currencies in the future. The 2018 global revolving credit facility matures on January 24, 2023 with two six-month extension options. In addition, we have the ability from time to time to increase the size of the global revolving credit facility and the unsecured term loans (discussed below), in any combination, by up to $1.25 billion, subject to receipt of lender commitments and other conditions precedent.

On October 24, 2018, we refinanced our senior unsecured multi-currency term loan facility and entered into an amended and restated term loan agreement, which we refer to as the 2018 term loan agreement, which governs (i) a $300.0 million 5-year senior unsecured term loan, which we refer to as the 2023 Term Loan and (ii) an approximately $512.0 million 5-year senior unsecured term loan, which we refer to as the 2024 Term Loan. The 2018 term loan agreement replaced the $1.55 billion term loan agreement executed on January 15, 2016. The 2018 term loan agreement provides for borrowings in Australian dollars, Canadian dollars, Hong Kong dollars, Singapore dollars and U.S. dollars. In addition, we have the ability from time to time to increase the aggregate size of lending under the 2018 term loan agreement and the global revolving credit facility (discussed above), in any combination, by up to $1.25 billion, subject to receipt of lender commitments and other conditions precedent. The maturity date of the 2023 Term Loan is January 15, 2023. The maturity date of the 2024 Term Loan is January 24, 2023 with two six-month extension options.

On October 24, 2018, we entered into a credit agreement for a ¥33.3 billion (approximately $296.5 million based on the exchange rate on October 24, 2018) senior unsecured revolving credit facility, which we refer to as the Yen revolving credit facility. The Yen revolving credit facility provides for borrowings in Japanese yen. In addition, we have the ability from time to time to increase the size of the Yen revolving credit facility to up to ¥93.3 billion (approximately $831.1 million based on the exchange rate on October 24, 2018), subject to receipt of lender commitments and other conditions precedent. The Yen revolving credit facility matures on January 24, 2024.

On October 24, 2018, the Operating Partnership, together with its subsidiary Quill Equity LLC as borrowers, entered into Amendment No. 1 to the Senior Secured Term Loan, which we refer to (as so amended) as the secured term loan agreement, which among other things amended the financial covenants therein to correspond with the financial covenants in the 2018 global senior credit agreement and the 2018 term loan agreement, decreased the applicable rate for eurodollar rate advances, and decreased the applicable rate for base rate advances. As of October 24, 2018, the applicable rate for eurodollar rate advances is the applicable index plus 100 basis points and the applicable rate for base rate advances is the applicable index plus 0 basis points. An annual agency fee is payable quarterly in respect of the commitments under the secured term loan agreement. We are also required to pay certain fees to the administrative agent under the secured term loan agreement.