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v3.21.2

Financing - Narrative (Details) - USD ($) |  | 1 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | --- | ---
Apr. 16, 2020 | Jan. 31, 2020 | Dec. 31, 2019 | Jun. 30, 2020 | Jun. 30, 2021 | Dec. 31, 2020
Short-term Debt [Line Items] |  |  |  |  |  |
Short-term debt |  |  |  |  | $ 15,000,000.0 | $ 375,700,000
Commercial Paper |  |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |  |
Debt instrument, maximum borrowing capacity |  |  |  | $ 550,000,000 |  |
Proceeds from Short-term Debt |  | $ 100,000,000 | $ 150,000,000 |  |  |
Commercial Paper |  |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |  |
Short-term debt |  |  |  |  | 15,000,000.0 | 27,200,000
Commercial Paper | Commercial Paper |  |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |  |
Debt instrument, maximum borrowing capacity |  |  |  | 550,000,000 |  |
Notes Payable to Banks |  |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |  |
Debt instrument, term (in days) | 364 days |  |  |  |  |
Line of Credit | Revolving Credit Facility |  |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |  |
Maximum borrowing capacity |  |  |  |  | 550,000,000 |
Proceeds from issuance of debt |  |  |  | $ 67,000,000 |  |
Long-term debt |  |  |  |  | 0 | 0
I&S (acquisition) |  |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |  |
Debt instrument, face amount |  | $ 100,000,000 |  |  |  |
364-Day Credit Agreement | Line of Credit |  |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |  |
Short-term debt |  |  |  |  | $ 0 | $ 348,500,000

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