Derivatives and Fair Value Measurements - Financial Instruments Measured at Fair Value (Details) - 2028 Notes Embedded Derivative [Member] - Level 3 [Member] $ in Millions	9 Months Ended
	Sep. 30, 2021 USD ($)
Fair Value Assets Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Balance at January 1, 2021	$ 2.3
Unrealized loss recorded in other income and (expense), net	(1.9)
Balance at September 30, 2021	$ 0.4