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Fair Value Measurements - Long-Term Debt (Details) - Senior Notes $ in Millions	Dec. 31, 2021 USD ($)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of notes	$ 2,490.0
Long-term debt	2,470.0
Unamortized discount and deferred financing costs related to senior notes	$ 27.0

Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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