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Earnings Per Share - Additional Information (Detail) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2021 | Mar. 31, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020
Forward Sale Agreement [Member] |  |  |  |  |
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items] |  |  |  |  |
Sale of common shares | 1,000,000.0 |  |  | 1,000,000.0 |
Performance Restricted Stock Units [Member] |  |  |  |  |
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items] |  |  |  |  |
Mark-to-market adjustment |  |  | $ (0.3) | $ (5.6) | $ 1.9
Common shares, shares issued |  | 570,295 |  |  |

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