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Interim Financial Statements (Tables) | 9 Months Ended
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Sep. 30, 2021
Interim Financial Statements. |
Summary of carrying values and fair values of senior subordinated notes and fixed rate mortgage facilities | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | September 30, 2021 | ​ | December 31, 2020 |
​ |  | Carrying Value |  | Fair Value |  | Carrying Value |  | Fair Value |
3.50% senior subordinated notes due 2025 | ​ | ​ | 544.3 | ​ | ​ | 561.3 | ​ | ​ | 543.2 | ​ | $ | 554.6 | ​
3.75% senior subordinated notes due 2029 | ​ | ​ | 494.1 | ​ | ​ | 497.5 | ​ | ​ | — | ​ | ​ | — | ​
Mortgage facilities | ​ |  | 319.8 | ​ |  | 326.1 | ​ |  | 458.1 | ​ |  | 474.7 | ​

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