Debt (Schedule of Letters of Credit Facilities) (Details) - USD ($) $ in Millions	Jun. 30, 2024	Dec. 31, 2023
Letter of Credit [Member]
Debt Instrument [Line Items]
Letters of credit, Limit	$ 175.0
Letters of credit, Used	7.4
Letters of credit, Available	167.6
Letter of Credit [Member] | Bi-lateral Facility [Member]
Debt Instrument [Line Items]
Letters of credit, Limit	25.0
Letters of credit, Used	7.4
Letters of credit, Available	17.6
Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Letters of credit, Limit	500.0
Letters of credit, Used	208.0	$ 140.0
Revolving Credit Facility [Member] | Letter of Credit [Member]
Debt Instrument [Line Items]
Letters of credit, Limit	150.0
Letters of credit, Available	$ 150.0