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