Derivatives	12 Months Ended
Dec. 31, 2019
Derivative Instruments And Hedging Activities Disclosure [Abstract]
Derivatives	13. Derivatives The Company entered into foreign currency forward contracts during the years ended December 31, 2019 and 2018 in connection with certain transfers of cash between the U.S. and U.K. under the Company’s cash management and foreign currency risk management programs. Foreign currency forward contracts limit the economic risk of changes in the exchange rate between US Dollars (“USD”) and British Pounds (“GBP”) associated with cash transfers. In May 2016, the Company entered into multiple cross currency swap agreements with an aggregate notional amount of $650.0 million to manage foreign currency risk by effectively converting a portion of its fixed-rate USD-denominated senior notes, including the semi-annual interest payments thereunder, to fixed-rate GBP-denominated debt of £449.3 million. In August 2019, the Company terminated its existing net investment cross currency swap derivatives of $105.0 million. Cash received from the termination of the cross currency swap derivatives is included in investing activities in the consolidated statements of cash flows. The related gain from this termination is included in accumulated other comprehensive loss in accordance with ASC 815-30-40-1. In August 2019, the Company also entered into multiple cross currency swap agreements with an aggregate notional amount of $650.0 million to manage foreign currency risk by effectively converting a portion of its fixed-rate USD-denominated senior notes, including the semi-annual interest payments thereunder, to fixed-rate GBP-denominated debt of £538.1 million. During the term of the swap agreements, the Company will receive semi-annual interest payments in USD from the counterparties at fixed interest rates, and the Company will make semi-annual interest payments in GBP to the counterparties at fixed interest rates. The interest payments under the cross-currency swap agreements result in £25.4 million of annual cash flows from the Company’s U.K. business being converted to $35.8 million. The Company has designated the cross currency swap agreements and certain forward contracts entered into during 2018 and 2019 as qualifying hedging instruments and is accounting for these as net investment hedges. The fair values of these derivatives at December 31, 2019 and 2018 of $(68.9) million and $60.5 million, respectively, are recorded as derivative instrument liabilities and derivative instrument assets, respectively, on the consolidated balance sheets. During the year ended 2019, the Company elected the spot method for recording its net investment hedges. Gains and losses resulting from the settlement of the excluded components are recorded in interest expense on the consolidated statements of operations. Gains and losses resulting from fair value adjustments to the cross currency swap agreements are recorded in accumulated other comprehensive loss as the swaps are effective in hedging the designated risk. Cash flows related to the cross currency swap derivatives are included in operating activities in the consolidated statements of cash flows.

Derivatives

12 Months Ended

Dec. 31, 2019

Derivative Instruments And Hedging Activities Disclosure [Abstract]

13. Derivatives

The Company entered into foreign currency forward contracts during the years ended December 31, 2019 and 2018 in connection with certain transfers of cash between the U.S. and U.K. under the Company’s cash management and foreign currency risk management programs. Foreign currency forward contracts limit the economic risk of changes in the exchange rate between US Dollars (“USD”) and British Pounds (“GBP”) associated with cash transfers.

In May 2016, the Company entered into multiple cross currency swap agreements with an aggregate notional amount of $650.0 million to manage foreign currency risk by effectively converting a portion of its fixed-rate USD-denominated senior notes, including the semi-annual interest payments thereunder, to fixed-rate GBP-denominated debt of £449.3 million. In August 2019, the Company terminated its existing net investment cross currency swap derivatives of $105.0 million. Cash received from the termination of the cross currency swap derivatives is included in investing activities in the consolidated statements of cash flows. The related gain from this termination is included in accumulated other comprehensive loss in accordance with ASC 815-30-40-1.

In August 2019, the Company also entered into multiple cross currency swap agreements with an aggregate notional amount of $650.0 million to manage foreign currency risk by effectively converting a portion of its fixed-rate USD-denominated senior notes, including the semi-annual interest payments thereunder, to fixed-rate GBP-denominated debt of £538.1 million. During the term of the swap agreements, the Company will receive semi-annual interest payments in USD from the counterparties at fixed interest rates, and the Company will make semi-annual interest payments in GBP to the counterparties at fixed interest rates. The interest payments under the cross-currency swap agreements result in £25.4 million of annual cash flows from the Company’s U.K. business being converted to $35.8 million.

The Company has designated the cross currency swap agreements and certain forward contracts entered into during 2018 and 2019 as qualifying hedging instruments and is accounting for these as net investment hedges. The fair values of these derivatives at December 31, 2019 and 2018 of $(68.9) million and $60.5 million, respectively, are recorded as derivative instrument liabilities and derivative instrument assets, respectively, on the consolidated balance sheets. During the year ended 2019, the Company elected the spot method for recording its net investment hedges. Gains and losses resulting from the settlement of the excluded components are recorded in interest expense on the consolidated statements of operations. Gains and losses resulting from fair value adjustments to the cross currency swap agreements are recorded in accumulated other comprehensive loss as the swaps are effective in hedging the designated risk. Cash flows related to the cross currency swap derivatives are included in operating activities in the consolidated statements of cash flows.