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Long-Term Debt - Credit Facility (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	Feb. 28, 2021	Nov. 30, 2019
Credit Facility
Line of Credit Facility
Letter of credit outstanding	$ 8.9
Debt instrument, variable rate (percentage)	2.40%
Debt instrument weighted average interest rate (percent)	2.60%	2.70%
Current borrowing capacity	$ 502.5
Undrawn capacity	506.6
Maximum borrowing capacity		$ 1,250.0		$ 750.0
Contingent increase in borrowing capacity	$ 250.0
Line of credit facility, commitment fee (percent)	0.375%
Commitment fee amount	$ 2.0	$ 2.0	$ 1.9
Credit Facility | LIBOR | Minimum
Line of Credit Facility
Debt instrument, variable rate (percentage)	2.00%
Credit Facility | LIBOR | Maximum
Line of Credit Facility
Debt instrument, variable rate (percentage)	2.75%
Credit Facility | Base Rate | Minimum
Line of Credit Facility
Debt instrument, variable rate (percentage)	1.00%
Credit Facility | Base Rate | Maximum
Line of Credit Facility
Debt instrument, variable rate (percentage)	1.75%
Credit Facility | Federal Funds Rate
Line of Credit Facility
Debt instrument, interest margin added to variable rate	0.50%
Credit Facility | One-month LIBOR
Line of Credit Facility
Debt instrument, interest margin added to variable rate	1.00%
Letters of Credit, Credit Facility
Line of Credit Facility
Maximum borrowing capacity	$ 50.0
Swing Line Loans, Credit Facility
Line of Credit Facility
Maximum borrowing capacity	50.0
Credit Facility, Amendment 3
Line of Credit Facility
Transaction costs				$ 1.8
Debt issuance cost written off	$ 4.9
Credit Facility, Amendment 2
Line of Credit Facility
Transaction costs					$ 6.4

X

- Definition

The interest margin added to the calculated variable rate of the debt instrument.

+ References

No definition available.

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- Definition

The contingent increase above the maximum borrowing capacity under the credit facility, if any one or more of the existing banks or new banks agree to provide such increased commitment amount.

+ References

No definition available.

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- Definition

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

+ References

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- Definition

Weighted average interest rate of debt outstanding.

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- Definition

Amount, before accumulated amortization, of debt issuance costs. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 3
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- Definition

The total amount of the contingent obligation under letters of credit outstanding as of the reporting date.

+ References

No definition available.

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- Definition

Amount of the fee for available but unused credit capacity under the credit facility.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
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- Definition

The fee, expressed as a percentage of the line of credit facility, for the line of credit facility regardless of whether the facility has been used.

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- Definition

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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- Definition

Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

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Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding).

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- Definition

Write-off of amounts previously capitalized as debt issuance cost in an extinguishment of debt.

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