Short-Term Borrowings and Credit Arrangements (Tables)

12 Months Ended

Dec. 31, 2021

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):

	2021		2020
Unsecured revolving line of credit, expiring September 2023	$	425.0	$	425.0
Unsecured revolving line of credit, expiring March 2023	25.0		25.0
	450.0		450.0
Amounts outstanding at December 31:
Eurodollar borrowings	373.0		222.0
Letters of credit	—		—
	373.0		222.0
Net availability as of December 31	$	77.0	$	228.0