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Financing (Tables) | 3 Months Ended
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Mar. 31, 2024
Debt Disclosure [Abstract] |
Schedule of Short-term Debt | Our Revolving Credit Facility and CP Program, which are classified as Notes payable on the Consolidated Balance Sheets, had the following borrowings, outstanding letters of credit, and available capacity (dollars in millions) as of:
| March 31, 2024 |  | December 31, 2023 |
Amount outstanding | $ | - |  | $ | - |
Letters of credit (a) | $ | 3.7 |  | $ | 3.7 |
Available capacity | $ | 746.3 |  | $ | 746.3 |
Weighted average interest rates | N/A |  | N/A |
(a) Letters of credit are off-balance sheet commitments that reduce the borrowing capacity available on our corporate Revolving Credit Facility. Revolving Credit Facility and CP Program borrowing activity was as follows (dollars in millions):
| Three Months Ended March 31, |
| 2024 |  | 2023 |
Maximum amount outstanding (based on daily outstanding balances) | $ | - |  | $ | 548.7 |
Average amount outstanding (based on daily outstanding balances) | $ | - |  | $ | 331.3 |
Weighted average interest rates | N/A |  |  | 4.91 | %
Summary of ATM Activity | ATM activity was as follows (in millions, except Average price per share amounts):
| Three Months Ended March 31, |
| 2024 |  | 2023 |
August 4, 2020 ATM Program |  |  |  |
Proceeds, (net of issuance costs of $0.0 and $(0.3), respectively) | $ | - |  | $ | 27.4 |
Number of shares issued |  | - |  |  | 0.4 |
June 16, 2023 ATM Program |  |  |  |
Proceeds, (net of issuance costs of $(0.3) and $0.0, respectively) | $ | 31.2 |  | $ | - |
Number of shares issued |  | 0.6 |  |  | - |
Total activity under both ATM Programs |  |  |  |
Proceeds, (net of issuance costs of $(0.3) and $(0.3), respectively) | $ | 31.2 |  | $ | 27.4 |
Number of shares issued |  | 0.6 |  |  | 0.4 |
Average price per share | $ | 52.51 |  | $ | 62.21 |
As of March 31, 2024, there were 47,596 shares issued under the ATM Program, but not settled.

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- Definition Tabular disclosure of short-term debt arrangements (having initial terms of repayment within one year or the normal operating cycle, if longer) including: (1) description of the short-term debt arrangement; (2) identification of the lender or type of lender; (3) repayment terms; (4) weighted average interest rate; (5) carrying amount of funds borrowed under the specified short-term debt arrangement as of the balance sheet date; (6) description of the refinancing of a short-term obligation when that obligation is excluded from current liabilities in the balance sheet; and (7) amount of a short-term obligation that has been excluded from current liabilities in the balance sheet because of a refinancing of the obligation. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480566/210-10-S99-1 + Details
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