Long Term and Other Debt (Details) - USD ($) $ in Millions	1 Months Ended	3 Months Ended	6 Months Ended
	Sep. 27, 2019	Jun. 30, 2020	Jun. 30, 2020
Debt Disclosure [Abstract]
Long term and other debt, description	On September 27, 2019, the Company, together with certain direct and indirect wholly-owned subsidiaries, entered into a Senior Facilities Agreement (the “SFA”) with Lucid Agency Services Limited, as agent, Nomura International plc and Macquarie Corporate Holdings Pty Limited (UK Branch) as arrangers and/or bookrunners and each lender party thereto (the “Lenders”), pursuant to which the Lenders agreed to provide, subject to certain conditions, two tranches of senior secured term loans (the “Term Loans”), in an original principal amount of £140.0 million ($173.0 million) and €90.0 million ($101.1 million), respectively and a secured revolving facility loan in an original principal amount of £20.0 million ($24.7 million).		(i) capitalizing certain interest payments that fell due on April 1, 2020, (ii) resetting the leverage and capital expenditure financial covenants applicable under the SFA, removing certain rating requirements under the SFA, (iii) allowing the Company and its subsidiaries to incur additional indebtedness under the UK Coronavirus Large Business Interruption Loan Scheme under a stand-alone facility, which may rank pari passu or junior to the facilities under the SFA, in an amount not exceeding £10.0 million ($12.4 million), (iv) removing certain rating requirements under the SFA, (v) limiting the ability of the Company and its subsidiaries to incur additional indebtedness, including by reducing the amount of general indebtedness the Company and its subsidiaries are permitted to incur and removing the ability to incur senior secured, second lien and unsecured indebtedness in an amount not exceeding the aggregate of (A) an unlimited amount, as long as, pro forma for the utilization of such indebtedness, the consolidated total net leverage ratio does not exceed the lower of 3.4:1 and the then applicable ratio with respect to the consolidated total net leverage financial covenant summarized further below, plus (B) an amount equal to the greater of £16.0 million ($19.8 million) and 25% of the consolidated pro forma EBITDA of the Company and its subsidiaries for the relevant period (as defined in the SFA, but disregarding, for the purposes of calculating the usage of such cap, any financial indebtedness applied to refinancing other financial indebtedness, together with any related interest, fees, costs and expenses), (vi) increasing the margin applicable to the Facilities (as defined in the SFA) by 1% and adding an additional payment-in-kind margin of 0.75% payable on any principal amounts outstanding under Facility B (as defined in the SFA) after September 24, 2021 (the “Relevant Date”), (vii) adding an exit fee payable by the Company with respect to any repayment or prepayment of Facility B after the Relevant Date at the time of such repayment or prepayment in an amount equal to 0.75% of the principal amount of Facility B being repaid or prepaid, (viii) removing any ability to carry forward or carry back any unused allowance under the capital expenditure financial covenant in the SFA and (ix) granting certain additional information rights to the Lenders under the SFA, including the provision of a budget, and certain board observation rights until December 31, 2022. All other material terms of the SFA remain unchanged in all material respects.
Equal fee,percentage			1.00%
Unamortized debt issuance costs		$ 3.1	$ 3.1
Interest expense		$ 1.0