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Debt Instrument, Covenant, Leverage Ratio, Maximum allowed

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Debt Instrument, Mandatory Prepayment Threshold

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Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Excludes cash and cash equivalents within disposal group and discontinued operation.

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Percentage points added to the reference rate to compute the variable rate on the debt instrument.

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Amount of the fee that accompanies borrowing money under the debt instrument.

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Contractual interest rate for funds borrowed, under the debt agreement.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Amount of the required periodic payments applied to principal.

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Amount of current borrowing capacity under the credit facility considering any current restrictions on the amount that could be borrowed (for example, borrowings may be limited by the amount of current assets), but without considering any amounts currently outstanding under the facility.

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The fee, expressed as a percentage of the line of credit facility, for available but unused credit capacity under the credit facility.

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Amount, after deduction of unamortized premium (discount) and debt issuance cost, of long-term debt. Excludes lease obligation.

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Debt - Narrative (Details)	Feb. 29, 2024 USD ($)	Feb. 28, 2024 USD ($)	Dec. 31, 2023 USD ($)	May 15, 2023 USD ($)	Aug. 07, 2020 USD ($)	May 14, 2023 USD ($)	Dec. 31, 2022 USD ($)
Debt Instrument [Line Items]
Long-term debt			$ 868,400,000				$ 1,413,800,000
Debt issuance costs, current, net			5,300,000				1,300,000
Disposal Group, Disposed of by Sale, Not Discontinued Operations
Debt Instrument [Line Items]
Cash				$ 217,200,000
Disposal Group, Disposed of by Sale, Not Discontinued Operations \| Travel Health Business
Debt Instrument [Line Items]
Disposal group, total consideration				270,200,000
Revolving Credit Facility
Debt Instrument [Line Items]
Repayments of long-term debt				$ 342,800,000
3.875% Senior Unsecured Notes due 2028 \| Prior to August 15, 2023
Debt Instrument [Line Items]
Debt instrument, redemption price, percentage					100.00%
3.875% Senior Unsecured Notes due 2028 \| Upon the Occurrence of a Change in Control \| Maximum
Debt Instrument [Line Items]
Debt instrument, redemption price, percentage					101.00%
Credit Agreement Amendment \| Federal Funds Rate
Debt Instrument [Line Items]
Debt instrument, basis spread on variable rate				0.50%
Credit Agreement Amendment \| Secured Overnight Financing Rate (SOFR)
Debt Instrument [Line Items]
Debt instrument, basis spread on variable rate				1.00%
Credit Agreement Amendment \| Base Rate
Debt Instrument [Line Items]
Debt instrument, basis spread on variable rate				5.00%
Credit Agreement Amendment \| Until March 31, 2024 \| SOFR, EURIBOR, Or CDOR
Debt Instrument [Line Items]
Debt instrument, basis spread on variable rate				6.00%
Credit Agreement Amendment \| Revolving Credit Facility
Debt Instrument [Line Items]
Current borrowing capacity				$ 300,000,000		$ 600,000,000
Debt instrument, periodic payment, principal				3,900,000
Credit Agreement Amendment \| Term Loan Facility
Debt Instrument [Line Items]
Debt instrument, covenant, consideration threshold			75,000,000	$ 75,000,000
Credit Agreement Amendment \| Maximum \| Fiscal Quarters Ending After March 31, 2024 \| SOFR, EURIBOR, Or CDOR
Debt Instrument [Line Items]
Debt instrument, basis spread on variable rate				4.00%
Credit Agreement Amendment \| Maximum \| Fiscal Quarters Ending After March 31, 2024 \| Base Rate
Debt Instrument [Line Items]
Debt instrument, basis spread on variable rate				3.00%
Credit Agreement Amendment \| Maximum \| Revolving Credit Facility
Debt Instrument [Line Items]
Line of credit facility, unused capacity, commitment fee percentage				0.40%
Credit Agreement Amendment \| Minimum \| Fiscal Quarters Ending After March 31, 2024 \| SOFR, EURIBOR, Or CDOR
Debt Instrument [Line Items]
Debt instrument, basis spread on variable rate				2.75%
Credit Agreement Amendment \| Minimum \| Fiscal Quarters Ending After March 31, 2024 \| Base Rate
Debt Instrument [Line Items]
Debt instrument, basis spread on variable rate				1.75%
Credit Agreement Amendment \| Minimum \| Revolving Credit Facility
Debt Instrument [Line Items]
Line of credit facility, unused capacity, commitment fee percentage				0.15%
Line of Credit
Debt Instrument [Line Items]
Long-term debt			219,200,000				598,000,000.0
Line of Credit \| Credit Agreement Amendment
Debt Instrument [Line Items]
Debt instrument, covenant, leverage ratio, maximum				4.50
Line of Credit \| Credit Agreement Amendment \| Fiscal Quarters Ending in 2024
Debt Instrument [Line Items]
Debt instrument, covenant, interest coverage ratio, minimum				2.25
Line of Credit \| Credit Agreement Amendment \| Fiscal Quarters Ending After 2024
Debt Instrument [Line Items]
Debt instrument, covenant, interest coverage ratio, minimum				2.50
Line of Credit \| Credit Agreement Amendment \| Revolving Credit Facility \| Subsequent Event
Debt Instrument [Line Items]
Mandatory prepayment threshold		$ 125,000,000
Mandatory principal prepayment percentage		75.00%
Line of Credit \| Credit Agreement Amendment \| Revolving Credit Facility \| SOFR, SONIA, and Eurocurrency \| Subsequent Event
Debt Instrument [Line Items]
Debt instrument, basis spread on variable rate		6.00%
Line of Credit \| Forbearance Agreement And Amendment \| Revolving Credit Facility \| Subsequent Event
Debt Instrument [Line Items]
Current borrowing capacity	$ 270,000,000
Line of credit facility, unused capacity, commitment fee percentage	0.40%
Mandatory prepayment threshold	$ 100,000,000
Mandatory principal prepayment percentage	100.00%
Forbearance fee	$ 1,200,000
Line of Credit \| Forbearance Agreement And Amendment \| Revolving Credit Facility \| Base Rate \| Subsequent Event
Debt Instrument [Line Items]
Debt instrument, basis spread on variable rate	5.00%
Line of Credit \| Forbearance Agreement And Amendment \| Revolving Credit Facility \| SOFR, SONIA, and Eurocurrency \| Subsequent Event
Debt Instrument [Line Items]
Debt instrument, basis spread on variable rate	6.50%
Senior Notes \| 3.875% Senior Unsecured Notes due 2028
Debt Instrument [Line Items]
Long-term debt			$ 450,000,000.0		$ 450,000,000		$ 450,000,000.0
Interest rate, stated percentage			3.875%		3.875%		3.875%
Term Loan
Debt Instrument [Line Items]
Repayments of long-term debt				$ 144,400,000
Term Loan \| Revolving Credit Facility
Debt Instrument [Line Items]
Long-term debt			$ 198,200,000				$ 362,800,000