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Interim Financial Statements (Tables) | 9 Months Ended
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Sep. 30, 2020
Interim Financial Statements. |
Summary of carrying values and fair values of senior subordinated notes and fixed rate mortgage facilities |
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | September 30, 2020 | ​ | December 31, 2019 |
​ |  | Carrying Value |  | Fair Value |  | Carrying Value |  | Fair Value |
5.75% senior subordinated notes due 2022 | ​ | ​ | 550.0 | ​ | ​ | 550.3 | ​ | ​ | 547.6 | ​ | ​ | 556.7 | ​
5.375% senior subordinated notes due 2024 | ​ | ​ | 298.4 | ​ | ​ | 304.5 | ​ | ​ | 298.0 | ​ | ​ | 306.7 | ​
3.50% senior subordinated notes due 2025 | ​ | ​ | 542.9 | ​ | ​ | 541.9 | ​ | ​ | — | ​ | ​ | — | ​
5.50% senior subordinated notes due 2026 | ​ | ​ | 496.2 | ​ | ​ | 511.9 | ​ | ​ | 495.7 | ​ | ​ | 521.7 | ​
Mortgage facilities | ​ |  | 333.8 | ​ |  | 354.8 | ​ |  | 423.2 | ​ |  | 430.9 | ​

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