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Debt - Summary (Details) - USD ($) $ in Millions | Sep. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Debt |  |
Total | $ 1,662.6 | $ 1,663.7
Less: unamortized discount and debt issuance costs | (16.3) | (18.8)
Less: amounts due within one year and short-term borrowings | (4.9) | (6.0)
Total long-term debt | 1,641.4 | 1,638.9
Unsecured revolving credit facility maturing September 3, 2025 |  |
Debt |  |
Total | 0.0 | 0.0
Senior unsecured notes due April 15, 2023 |  |
Debt |  |
Total | 500.0 | 500.0
Senior unsecured notes due August 15, 2025 |  |
Debt |  |
Total | 400.0 | 400.0
Senior unsecured notes due August 15, 2030 |  |
Debt |  |
Total | 500.0 | 500.0
Senior unsecured notes due November 15, 2036 |  |
Debt |  |
Total | 250.0 | 250.0
Other notes and revolving credit facilities |  |
Debt |  |
Total | $ 12.6 | $ 13.7

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