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Short-Term Borrowings and Credit Arrangements (Tables)
 12 Months Ended
Dec. 31, 2022
Line of Credit Facility [Line Items]  
Line of credit facilities availability
The availability under the facilities in place for the years ended December 31 is shown in the following table (in millions):
20222021
Unsecured revolving line of credit, expiring May 2027$425.0 $425.0 
Unsecured revolving line of credit, expiring April 2024100.0 — 
Unsecured revolving line of credit, expiring March 202425.0 25.0 
550.0 450.0 
Amounts outstanding at December 31:
SOFR borrowings450.0 — 
Eurodollar borrowings— 373.0 
Letters of credit— — 
450.0 373.0 
Net availability as of December 31$100.0 $77.0