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Derivatives and Fair Value Measurements - Fair Value of Long-term Debt (Details) - USD ($) $ in Millions | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Fair Value of Debt [Line Items] |  |
Total debt at par value | $ 1,137.8 | $ 1,547.8
Carrying Amount |  |
Fair Value of Debt [Line Items] |  |
Total debt at par value | 1,173.2 | 1,591.3
Less: Unamortized debt issuance costs and original issue discount | (35.4) | (43.5)
Net carrying amount | 1,137.8 | 1,547.8
Estimated Fair Value |  |
Fair Value of Debt [Line Items] |  |
Estimated fair value | $ 1,136.5 | $ 987.6

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