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Debt - Schedule of Carrying Values and Estimated Fair Values of Debt Instruments (Details) - Senior Notes - USD ($) $ in Millions	Dec. 31, 2024	Dec. 31, 2023	May 31, 2023	May 31, 2020
Senior Convertible Notes
Total principal amount	$ 2,457.5	$ 2,457.5
Unamortized debt issuance costs	(16.1)	(23.3)
Carrying amount of senior convertible notes	2,441.4	2,434.2
Senior Convertible Notes due 2025
Senior Convertible Notes
Total principal amount	1,207.5	1,207.5		$ 1,210.0
Senior Convertible Notes due 2028
Senior Convertible Notes
Total principal amount	$ 1,250.0	$ 1,250.0	$ 1,250.0

X

- Definition

Including the current and noncurrent portions, carrying value as of the balance sheet date of a written promise to pay a note, initially due after one year or beyond the operating cycle if longer, which can be exchanged for a specified amount of one or more securities (typically common stock), at the option of the issuer or the holder.

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- Definition

Face (par) amount of debt instrument at time of issuance.

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- Definition

The remaining balance of debt issuance expenses that were capitalized and are being amortized against income over the lives of the respective bond issues. This does not include the amounts capitalized as part of the cost of the utility plant or asset.

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