Debt (Issuance of Green Senior Notes) (Details) - Senior Notes - USD ($) $ in Millions	Mar. 31, 2024	Feb. 06, 2024
Green Bonds
Debt Instrument [Line Items]
Debt instrument, face amount		$ 2,500.0
Deferred financing charges and discounts		$ 20.0
Long-term debt, principal amount	$ 2,500.0
Senior Note Four Point Six Percent, Green Bonds
Debt Instrument [Line Items]
Interest rate (percent)	4.60%
Long-term debt, principal amount	$ 750.0
Senior Note Four Point Seven Five Percent, Green Bonds
Debt Instrument [Line Items]
Interest rate (percent)	4.75%
Long-term debt, principal amount	$ 600.0
Senior Note Four Point Eight Five Percent, Green Bonds
Debt Instrument [Line Items]
Interest rate (percent)	4.85%
Long-term debt, principal amount	$ 1,150.0

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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