Debt (Schedule of Letters of Credit Facilities) (Details) $ in Millions	Dec. 31, 2021 USD ($)
Letter of Credit [Member]
Debt Instrument [Line Items]
Letters of credit, Limit	$ 175.0
Letters of credit, Used	8.4
Letters of credit, Available	166.6
Letter of Credit [Member] | Bi-lateral Facility [Member]
Debt Instrument [Line Items]
Letters of credit, Limit	25.0
Letters of credit, Used	8.4
Letters of credit, Available	16.6
Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Letters of credit, Limit	500.0
Revolving Credit Facility [Member] | Letter of Credit [Member]
Debt Instrument [Line Items]
Letters of credit, Limit	150.0
Letters of credit, Available	$ 150.0