Pension Plan (Details) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2020	Dec. 31, 2019
Retirement Benefits [Abstract]
Description of plan investment policy strategy	It was determined that contingent contributions of $1.1 million and expense contributions of $0.4 million would be payable during the year ended December 31, 2020, with agreement reached with the trustees of the scheme to defer $0.4 million of the contingent contributions into the year ending December 31, 2021 The funding level of the scheme will next be tested against the expected position at December 31, 2020 to determine whether further contingent contributions are payable during the year ending December 31, 2021.
Defined Benefit Plan Contributions By Employer	$ 0.6	$ 0.2