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Debt - Long-Term Debt (Parenthetical) (Details) - USD ($)	9 Months Ended	12 Months Ended
	Sep. 30, 2021	Dec. 31, 2020	Sep. 13, 2021
2021 Credit Agreement
Debt Instrument [Line Items]
Amount available under credit facility			$ 600,000,000
2021 Credit Agreement | 2021 Term Loan
Debt Instrument [Line Items]
Basis spread on term loan	1.375%
Term loan combined interest rate	1.51%
Maturity period	Sep. 30, 2026
2021 Credit Agreement | Revolving Loan
Debt Instrument [Line Items]
Amount available under credit facility	$ 450,000,000		450,000,000
Maturity period	Sep. 30, 2026
2018 Credit Agreement
Debt Instrument [Line Items]
Amount available under credit facility			$ 350,000,000
2018 Credit Agreement | 2018 Term Loan
Debt Instrument [Line Items]
Basis spread on term loan	1.50%
Term loan combined interest rate	1.51%	1.75%
Maturity period	Mar. 31, 2023
2018 Credit Agreement | Revolving Loan
Debt Instrument [Line Items]
Amount available under credit facility	$ 200,000,000
Maturity period	Mar. 31, 2023
Senior Convertible Notes 2016
Debt Instrument [Line Items]
Maturity period	Mar. 15, 2036
Interest rate on senior subordinated convertible notes	4.25%

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- Definition

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

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The average effective interest rate during the reporting period.

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

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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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