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Financing Arrangements - 2025 Convertible Senior Notes (Details)		1 Months Ended	3 Months Ended		6 Months Ended		12 Months Ended
	May 31, 2020 USD ($) $ / shares	May 31, 2020 USD ($) $ / shares	Jun. 30, 2024 USD ($)	Jun. 30, 2023 USD ($)	Jun. 30, 2024 USD ($)	Jun. 30, 2023 USD ($)	Dec. 31, 2023 USD ($) shares	Dec. 31, 2022 USD ($) shares	Dec. 31, 2021 USD ($) shares
Debt Instrument [Line Items]
Loss on extinguishment of debt			$ 0	$ 50,300,000	$ 0	$ 50,300,000
2025 Notes
Debt Instrument [Line Items]
Conversion price (in dollars per share) | $ / shares	$ 37.43	$ 37.43
2025 Notes | Convertible Debt
Debt Instrument [Line Items]
Debt principal amount	$ 575,000,000.0	$ 575,000,000.0
Interest rate	0.75%	0.75%
Principal			$ 0		$ 0		$ 0
Repurchased face amount							123,000,000.0		$ 400,000,000.0
Repayments of convertible debt							172,700,000		400,700,000
Debt conversion, converted instrument, amount									1,321,000,000
Loss on extinguishment of debt							50,300,000		72,200,000
Debt instrument, fair value									355,300,000
Carrying amount, net									$ 283,100,000
Effective interest rate									4.08%
Equity component of convertible debt									$ 965,700,000
Interest payable							500,000
Deferred debt issuance cost, write-off							1,100,000
Convertible debt, conversion ratio		0.0267187
2025 Notes | Convertible Debt | Certain Holders Conversion
Debt Instrument [Line Items]
Debt conversion, converted instrument, amount							$ 35,400,000	$ 16,600,000
Convertible debt, conversion ratio	0.0285913
2025 Notes | Convertible Debt | Class A common stock
Debt Instrument [Line Items]
Number of shares issued upon debt conversion (in shares) | shares							500,000	300,000	7,600,000
Debt conversion converted instrument additional shares initial conversion (in shares) | shares							1.8726

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Amount of interest payable on debt, including, but not limited to, trade payables.

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Amount, after deduction of unamortized premium (discount) and debt issuance cost, of long-term debt. Excludes lease obligation.

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The cash outflow from the repayment of a long-term debt instrument which can be exchanged for a specified amount of another security, typically the entity's common stock, at the option of the issuer or the holder.

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

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