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v3.21.1

Debt (Tables) | 3 Months Ended
--- | ---
Mar. 31, 2021
Debt |
Summary of debt | ​
​ | ​ | ​ | ​ | ​ | ​
​ | March 31, | ​ | December 31,
​ | 2021 |  | 2020
​ | (in millions)
Unsecured revolving credit facility maturing September 3, 2025 | $ | — | ​ | $ | —
Senior unsecured notes due April 15, 2023 | ​ | 500.0 | ​ | ​ | 500.0
Senior unsecured notes due August 15, 2025 | ​ | 400.0 | ​ | ​ | 400.0
Senior unsecured notes due August 15, 2030 | ​ | 500.0 | ​ | ​ | 500.0
Senior unsecured notes due November 15, 2036 | ​ | 250.0 | ​ | ​ | 250.0
Other notes and revolving credit facilities | ​ | 12.9 | ​ | ​ | 13.7
Total | ​ | 1,662.9 | ​ | ​ | 1,663.7
Less: unamortized discount and debt issuance costs | ​ | (18.0) | ​ | ​ | (18.8)
Less: amounts due within one year and short-term borrowings | ​ | (5.2) | ​ | ​ | (6.0)
Total long-term debt | $ | 1,639.7 | ​ | $ | 1,638.9

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- Definition Tabular disclosure of information pertaining to short-term and long-debt instruments or arrangements, including but not limited to identification of terms, features, collateral requirements and other information necessary to a fair presentation. + References No definition available. + Details
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