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Debt - Summary (Details) - USD ($) $ in Millions | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Debt |  |
Total | $ 1,662.4 | $ 1,663.7
Less: unamortized discount and debt issuance costs | (15.4) | (18.8)
Less: amounts due within one year and short-term borrowings | (5.0) | (6.0)
Total long-term debt | 1,642.0 | 1,638.9
Unsecured revolving credit facility maturing September 3, 2025 |  |
Debt |  |
Total | 0.0 | 0.0
Senior unsecured notes, interest payable semi-annually at 4.50%, effective rate of 4.63%, maturing April 15, 2023 |  |
Debt |  |
Total | $ 500.0 | 500.0
Semi-annual rate (as a percent) | 4.50% |
Effective rate (as a percent) | 4.63% |
Senior unsecured notes, interest payable semi-annually at 1.30%, effective rate of 1.53%, maturing August 15, 2025 |  |
Debt |  |
Total | $ 400.0 | 400.0
Semi-annual rate (as a percent) | 1.30% |
Effective rate (as a percent) | 1.53% |
Senior unsecured notes, interest payable semi-annually at 2.15%, effective rate of 2.27%, maturing August 15, 2030 |  |
Debt |  |
Total | $ 500.0 | 500.0
Semi-annual rate (as a percent) | 2.15% |
Effective rate (as a percent) | 2.27% |
Senior unsecured notes, interest payable semi-annually at 6.85%, effective rate of 6.91%, maturing November 15, 2036 |  |
Debt |  |
Total | $ 250.0 | 250.0
Semi-annual rate (as a percent) | 6.85% |
Effective rate (as a percent) | 6.91% |
Other notes and revolving credit facilities |  |
Debt |  |
Total | $ 12.4 | $ 13.7

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