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Interim Financial Statements (Tables) | 3 Months Ended
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Mar. 31, 2021
Interim Financial Statements. |
Summary of carrying values and fair values of senior subordinated notes and fixed rate mortgage facilities | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | March 31, 2021 | ​ | December 31, 2020 |
​ |  | Carrying Value |  | Fair Value |  | Carrying Value |  | Fair Value |
3.50% senior subordinated notes due 2025 | ​ | $ | 543.6 | ​ | $ | 558.1 | ​ | $ | 543.2 | ​ | $ | 554.6 | ​
5.50% senior subordinated notes due 2026 | ​ | ​ | 496.6 | ​ | ​ | 512.3 | ​ | ​ | 496.4 | ​ | ​ | 515.0 | ​
Mortgage facilities | ​ |  | 453.7 | ​ |  | 456.7 | ​ |  | 458.1 | ​ |  | 474.7 | ​

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