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Earnings per Common Share - Summary of Potential Common Stock Equivalents Excluded from Determination of Diluted Earnings Per Share (Details) - shares
shares in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Unvested Restricted Stock Awards [Member]        
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]        
Anti-dilutive shares excluded from the determination of diluted earnings per share (in shares) 0.3 3.2 0.3 0.8
Series A Preferred Stock [Member]        
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]        
Anti-dilutive shares excluded from the determination of diluted earnings per share (in shares) [1] 44.3 46.5 44.3 46.5
[1] The Series A Preferred has no mandatory redemption date, but is redeemable at our election for a 10% premium to the liquidation preference on or prior to March 16, 2022 and for a 5% premium to the liquidation preference thereafter. If the Series A Preferred is not redeemed prior to March 16, 2028, the investors have the right to convert the Series A Preferred into TRC common stock.