Debt	9 Months Ended
Sep. 30, 2018
Debt Disclosure [Abstract]
Debt	Debt In June 2018, we entered into a credit agreement for the financing of a portion of the purchase price payable for the Silversea Cruises acquisition. This agreement made available to us an unsecured U.S. dollar denominated term loan with a maximum aggregate principal amount of $700 million. On July 31, 2018, we closed on the Silversea Cruises acquisition and subsequently drew in full on this credit agreement. The loan is due in July 2019 and we are required to prepay the loan with the proceeds of certain debt issuances prior to maturity. Interest on the loan accrues at a floating rate based on LIBOR plus a margin that varies with our credit rating and which is currently 1.00%. Upon our acquisition of Silversea Cruises, we recorded, at a fair value of $672.0 million, 7.25% senior secured notes with a principal amount of $620 million due February 2025, in accordance with ASC 805. The notes were issued by Silversea Cruise Finance Ltd., a wholly owned subsidiary of Silversea Cruises, and are guaranteed and secured by substantially all of the assets of Silversea Cruises and a number of its subsidiaries, subject to certain exceptions. Refer to Note 3. Business Combination for further information on the Silversea Cruises acquisition. In June 2018, we established a commercial paper program pursuant to which we may issue short-term unsecured notes from time to time in an aggregate amount of up to $1.2 billion. The interest rate for the commercial paper notes varies based on duration, market conditions and our credit ratings. The maturities of the commercial paper notes can vary, but cannot exceed 397 days from the date of issuance. We intend to use the proceeds from our commercial paper notes for general corporate purposes. The commercial paper issued is backstopped by our revolving credit facilities. As of September 30, 2018, we had $1.0 billion of commercial paper notes outstanding with a weighted average interest rate of 2.73% and a weighted average maturity of approximately 32 days. In March 2018, we took delivery of Symphony of the Seas. We had previously entered into a financing arrangement for the United States dollar financing of this ship in January 2015. Through the financing arrangement, we had the right, but not the obligation, to satisfy the obligations to be incurred upon delivery and acceptance of the vessel under the shipbuilding contract by assuming through a novation agreement, at delivery and acceptance, the debt indirectly incurred by the shipbuilder during the construction of the ship. We borrowed a total of $1.2 billion under our previously committed unsecured term loan, which includes the execution of the novation to satisfy a portion of our final obligation under our shipbuilding agreement. The loan amortizes semi-annually over 12 years and bears interest at a fixed rate of 3.82%. In our consolidated statement of cash flows for the nine months ended September 30, 2018, the acceptance of the ship and satisfaction of our obligation under the shipbuilding contract was classified as an outflow and constructive disbursement within Investing Activities while the amounts novated and effectively advanced from our lender under our previously committed unsecured term loan were classified as an inflow and constructive receipt within Financing Activities. In March 2018, we entered into and drew in full on a credit agreement in the amount of $130.0 million due February 2023. The loan accrues interest at a floating rate of LIBOR plus an applicable margin. The applicable margin varies with our debt rating and was 1.195% as of September 30, 2018. Amounts from the issuance of this loan were used for capital expenditures. Capital Leases Silversea Cruises operates two ships, the Silver Whisper and Silver Explorer, under capital leases. The capital lease for the Silver Whisper will expire in 2022, subject to an option to purchase the ship, and the capital lease for the Silver Explorer will expire in 2021, subject to an option to extend the lease for up to an additional six years. The total aggregate amount of the finance lease obligations recorded for these ships at the acquisition date was $82.8 million with remaining net future minimum annual lease payments of $18.8 million. The lease payments on the Silver Whisper are subject to adjustments based on the LIBOR rate. Refer to Note 3. Business Combination for further information regarding the balance sheet allocation on the assets acquired and liabilities assumed in the Silversea Cruises acquisition.

Debt

In June 2018, we entered into a credit agreement for the financing of a portion of the purchase price payable for the Silversea Cruises acquisition. This agreement made available to us an unsecured U.S. dollar denominated term loan with a maximum aggregate principal amount of $700 million. On July 31, 2018, we closed on the Silversea Cruises acquisition and subsequently drew in full on this credit agreement. The loan is due in July 2019 and we are required to prepay the loan with the proceeds of certain debt issuances prior to maturity. Interest on the loan accrues at a floating rate based on LIBOR plus a margin that varies with our credit rating and which is currently 1.00%.

Upon our acquisition of Silversea Cruises, we recorded, at a fair value of $672.0 million, 7.25% senior secured notes with a principal amount of $620 million due February 2025, in accordance with ASC 805. The notes were issued by Silversea Cruise Finance Ltd., a wholly owned subsidiary of Silversea Cruises, and are guaranteed and secured by substantially all of the assets of Silversea Cruises and a number of its subsidiaries, subject to certain exceptions. Refer to Note 3. Business Combination for further information on the Silversea Cruises acquisition.

In June 2018, we established a commercial paper program pursuant to which we may issue short-term unsecured notes from time to time in an aggregate amount of up to $1.2 billion. The interest rate for the commercial paper notes varies based on duration, market conditions and our credit ratings. The maturities of the commercial paper notes can vary, but cannot exceed 397 days from the date of issuance. We intend to use the proceeds from our commercial paper notes for general corporate purposes. The commercial paper issued is backstopped by our revolving credit facilities. As of September 30, 2018, we had $1.0 billion of commercial paper notes outstanding with a weighted average interest rate of 2.73% and a weighted average maturity of approximately 32 days.

In March 2018, we took delivery of Symphony of the Seas. We had previously entered into a financing arrangement for the United States dollar financing of this ship in January 2015. Through the financing arrangement, we had the right, but not the obligation, to satisfy the obligations to be incurred upon delivery and acceptance of the vessel under the shipbuilding contract by assuming through a novation agreement, at delivery and acceptance, the debt indirectly incurred by the shipbuilder during the construction of the ship. We borrowed a total of $1.2 billion under our previously committed unsecured term loan, which includes the execution of the novation to satisfy a portion of our final obligation under our shipbuilding agreement. The loan amortizes semi-annually over 12 years and bears interest at a fixed rate of 3.82%. In our consolidated statement of cash flows for the nine months ended September 30, 2018, the acceptance of the ship and satisfaction of our obligation under the shipbuilding contract was classified as an outflow and constructive disbursement within Investing Activities while the amounts novated and effectively advanced from our lender under our previously committed unsecured term loan were classified as an inflow and constructive receipt within Financing Activities.

In March 2018, we entered into and drew in full on a credit agreement in the amount of $130.0 million due February 2023. The loan accrues interest at a floating rate of LIBOR plus an applicable margin. The applicable margin varies with our debt rating and was 1.195% as of September 30, 2018. Amounts from the issuance of this loan were used for capital expenditures.

Capital Leases

Silversea Cruises operates two ships, the Silver Whisper and Silver Explorer, under capital leases. The capital lease for the Silver Whisper will expire in 2022, subject to an option to purchase the ship, and the capital lease for the Silver Explorer will expire in 2021, subject to an option to extend the lease for up to an additional six years. The total aggregate amount of the finance lease obligations recorded for these ships at the acquisition date was $82.8 million with remaining net future minimum annual lease payments of $18.8 million. The lease payments on the Silver Whisper are subject to adjustments based on the LIBOR rate. Refer to Note 3. Business Combination for further information regarding the balance sheet allocation on the assets acquired and liabilities assumed in the Silversea Cruises acquisition.