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Debt - Schedule of Convertible Notes (Details) - USD ($) $ in Millions	Mar. 31, 2022	Dec. 31, 2021
Debt Instrument [Line Items]
Principal balance	$ 1,389.1
Convertible Debt
Debt Instrument [Line Items]
Principal balance	1,389.1	$ 1,389.1
Unamortized issuance costs	(17.9)	(18.8)
Carrying value, net	1,371.2	1,370.3
Convertible Debt | 2026 Notes
Debt Instrument [Line Items]
Principal balance	695.8	695.8
Unamortized issuance costs	(8.6)	(9.1)
Carrying value, net	687.2	686.7
Convertible Debt | 2028 Notes
Debt Instrument [Line Items]
Principal balance	693.3	693.3
Unamortized issuance costs	(9.3)	(9.7)
Carrying value, net	$ 684.0	$ 683.6

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Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

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- Definition

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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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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