Overview and Summary of Significant Accounting Policies - Narrative (Details) $ in Millions		1 Months Ended		12 Months Ended
	Jul. 30, 2021 USD ($)	Sep. 30, 2021	Jul. 31, 2021	Dec. 31, 2023 USD ($)	Dec. 31, 2023 GBP (£)	Dec. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)	Oct. 06, 2023 USD ($)
Overview and Summary of Significant Accounting Policies [Line Items]
Remaining benefits received from various other programs						$ 0.7	$ 4.2
Remaining maturities of highly liquid instruments				three months or less	three months or less
Percentage of non equity ownership related redeemable noncontrolling interests				56.40%	56.40%
Government assistance received [Extensible Enumeration]						Costs and Expenses	Costs and Expenses
Government assistance received				$ 0.0		$ 2.7	$ 21.6
CEWS | GES
Overview and Summary of Significant Accounting Policies [Line Items]
Government assistance received						1.4	1.9
CEWS | Pursuit
Overview and Summary of Significant Accounting Policies [Line Items]
Government assistance received							11.6
CJRS
Overview and Summary of Significant Accounting Policies [Line Items]
Employee salary reimbursement | £					£ 2,500
Employees' salaries reimbursement, percent				80.00%	80.00%
Percentage of employer matching contribution with employee gross pay		20.00%	10.00%
CJRS | GES
Overview and Summary of Significant Accounting Policies [Line Items]
Government assistance received							0.9
NOW
Overview and Summary of Significant Accounting Policies [Line Items]
Employees' salaries reimbursement, percent				85.00%	85.00%
NOW and TVL programs | GES
Overview and Summary of Significant Accounting Policies [Line Items]
Government assistance received						$ 0.6	$ 3.0
2021 Credit Facility
Overview and Summary of Significant Accounting Policies [Line Items]
Fees	$ 14.8
Maximum borrowing capacity on credit facility	500.0
Revolving Credit Facility
Overview and Summary of Significant Accounting Policies [Line Items]
Borrowing capacity on line of credit				$ 57.0
Maximum borrowing capacity on credit facility	$ 450.0
Revolving Credit Facility | 2021 Credit Facility
Overview and Summary of Significant Accounting Policies [Line Items]
Maturity date	Jul. 30, 2026
Maximum borrowing capacity on credit facility	$ 100.0
Term Loan B | 2021 Credit Facility
Overview and Summary of Significant Accounting Policies [Line Items]
Borrowing capacity on line of credit	$ 400.0
Maturity date	Jul. 30, 2028
Maximum borrowing capacity on credit facility								$ 60.0
Loans Proceeds Offset	$ 327.0
Maximum
Overview and Summary of Significant Accounting Policies [Line Items]
Lease expiration period				34 years	34 years
Share based compensation arrangements requisite service period				3 years	3 years
Maximum | TVL
Overview and Summary of Significant Accounting Policies [Line Items]
Non-labor business expenses claimed, percent				30.00%	30.00%
Maximum | Building
Overview and Summary of Significant Accounting Policies [Line Items]
Property, plant and equipment, useful life				40 years
Maximum | Equipment
Overview and Summary of Significant Accounting Policies [Line Items]
Property, plant and equipment, useful life				12 years
Maximum | Land
Overview and Summary of Significant Accounting Policies [Line Items]
Lease expiration period				46 years	46 years
Minimum
Overview and Summary of Significant Accounting Policies [Line Items]
Share based compensation arrangements requisite service period				1 year	1 year
Minimum | Building
Overview and Summary of Significant Accounting Policies [Line Items]
Property, plant and equipment, useful life				15 years
Minimum | Equipment
Overview and Summary of Significant Accounting Policies [Line Items]
Property, plant and equipment, useful life				3 years