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Consolidated Statement of Stockholders' Equity (unaudited) - USD ($)
shares in Millions, $ in Millions
Total
Accelerated Share Repurchase Program
Common Stock
Capital in Excess of Par Value
Capital in Excess of Par Value
Accelerated Share Repurchase Program
Retained Earnings
Accumulated other comprehensive income (loss)
Treasury Stock
Treasury Stock
Accelerated Share Repurchase Program
Trinity Stockholders’ Equity
Noncontrolling Interest
$0.01 Par Value $ 0.01                    
Increase (Decrease) in Stockholders' Equity [Roll Forward]                      
Common Stock, Shares, Issued     (83.3)         0.0      
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest, Beginning Balance at Dec. 31, 2021 $ 1,296.8   $ 0.8 $ 0.0   $ 1,046.6 $ (17.0) $ (0.6)   $ 1,029.8 $ 267.0
Increase (Decrease) in Stockholders' Equity [Roll Forward]                      
Net income 1.9         (0.7)       (0.7) 2.6
Other comprehensive loss 17.3           17.1     17.1 0.2
Cash dividends declared on common stock (1) [1] (19.3)         (19.3)       (19.3)  
Distributions to noncontrolling interest (6.2)                   (6.2)
Stock-based compensation expense 5.1     5.1           5.1  
Settlement of share-based awards, net 0.0     0.2       (0.2)   0.0  
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest, Ending Balance at Mar. 31, 2022 $ 1,295.6   0.8 5.3   1,026.6 0.1 (0.8)   1,032.0 263.6
Increase (Decrease) in Stockholders' Equity [Roll Forward]                      
Common Stock, Dividends, Per Share, Declared $ 0.23                    
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest, Beginning Balance at Dec. 31, 2021 $ 1,296.8   0.8 0.0   1,046.6 (17.0) (0.6)   1,029.8 267.0
Increase (Decrease) in Stockholders' Equity [Roll Forward]                      
Net income 36.7                    
Other comprehensive loss 32.9                    
Stock-based compensation expense 16.7                    
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest, Ending Balance at Sep. 30, 2022 $ 1,261.1   $ 0.8 6.1   997.7 16.4 $ (15.1)   1,005.9 255.2
Increase (Decrease) in Stockholders' Equity [Roll Forward]                      
Shares repurchased   (0.8)                  
Shares repurchased                 $ (25.0)    
$0.01 Par Value $ 0.01                    
Common Stock, Shares, Issued     (83.3)         0.0      
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest, Beginning Balance at Mar. 31, 2022 $ 1,295.6   $ 0.8 5.3   1,026.6 0.1 $ (0.8)   1,032.0 263.6
Increase (Decrease) in Stockholders' Equity [Roll Forward]                      
Net income 8.5         3.7       3.7 4.8
Other comprehensive loss 5.3           6.3     6.3 (1.0)
Cash dividends declared on common stock (1) [1] (19.1)         (19.1)       (19.1)  
Distributions to noncontrolling interest (8.8)                   (8.8)
Stock-based compensation expense 5.7     5.7           5.7  
Settlement of share-based awards, net (5.7)     0.4       (6.1)   (5.7)  
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest, Ending Balance at Jun. 30, 2022 1,256.2   $ 0.8 0.0   991.1 6.4 $ (0.7)   997.6 258.6
Increase (Decrease) in Stockholders' Equity [Roll Forward]                      
Restricted shares, net, (in shares)     (0.8)         (0.2)      
Shares repurchased               (1.0) (0.8)    
Shares repurchased (25.3) $ 0.0     $ (25.0)     $ (25.3) $ (25.0) (25.3)  
Treasury Stock, Shares, Retired     (2.0)         (2.0)      
Retirement of treasury stock $ 0.0   $ 0.0 (36.4)   (20.1)   $ (56.5)   0.0  
Common Stock, Dividends, Per Share, Declared $ 0.23                    
$0.01 Par Value $ 0.01                    
Common Stock, Shares, Issued     (82.1)         0.0      
Net income $ 26.3         25.8       25.8 0.5
Other comprehensive loss 10.3           10.0     10.0 0.3
Cash dividends declared on common stock (1) [1] (19.2)         (19.2)       (19.2)  
Distributions to noncontrolling interest (4.2)                   (4.2)
Stock-based compensation expense 5.9     5.9           5.9  
Settlement of share-based awards, net (0.1)     0.2       $ (0.3)   (0.1)  
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest, Ending Balance at Sep. 30, 2022 1,261.1   $ 0.8 6.1   997.7 16.4 $ (15.1)   1,005.9 255.2
Increase (Decrease) in Stockholders' Equity [Roll Forward]                      
Shares repurchased               (0.6)      
Shares repurchased $ (14.1)             $ (14.1)   (14.1)  
Common Stock, Dividends, Per Share, Declared $ 0.23                    
$0.01 Par Value 0.01                    
Common Stock, Shares, Issued     (82.1)         (0.6)      
$0.01 Par Value $ 0.01                    
Common Stock, Shares, Issued     (81.1)         0.0      
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest, Beginning Balance at Dec. 31, 2022 $ 1,269.6   $ 0.8 0.0   992.6 19.7 $ (0.7)   1,012.4 257.2
Increase (Decrease) in Stockholders' Equity [Roll Forward]                      
Net income 13.7         4.4       4.4 9.3
Other comprehensive loss (14.4)           (7.0)     (7.0) (7.4)
Cash dividends declared on common stock (1) [2] (21.4)         (21.4)       (21.4)  
Distributions to noncontrolling interest (2.9)                   (2.9)
Stock-based compensation expense 6.2     6.2           6.2  
Settlement of share-based awards, net (0.4)     0.4       (0.8)   (0.4)  
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest, Ending Balance at Mar. 31, 2023 $ 1,250.4   0.8 6.6   975.6 12.7 (1.5)   994.2 256.2
Increase (Decrease) in Stockholders' Equity [Roll Forward]                      
Common Stock, Dividends, Per Share, Declared $ 0.26                    
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest, Beginning Balance at Dec. 31, 2022 $ 1,269.6   0.8 0.0   992.6 19.7 (0.7)   1,012.4 257.2
Increase (Decrease) in Stockholders' Equity [Roll Forward]                      
Net income 58.5                    
Other comprehensive loss (9.2)                   (7.2)
Stock-based compensation expense 18.8                    
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest, Ending Balance at Sep. 30, 2023 $ 1,253.4   $ 0.8 12.2   971.1 17.7 $ (1.0)   1,000.8 252.6
$0.01 Par Value $ 0.01                    
Increase (Decrease) in Stockholders' Equity [Roll Forward]                      
Common Stock, Shares, Issued     (81.1)         0.0      
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest, Beginning Balance at Mar. 31, 2023 $ 1,250.4   $ 0.8 6.6   975.6 12.7 $ (1.5)   994.2 256.2
Increase (Decrease) in Stockholders' Equity [Roll Forward]                      
Net income 21.2         17.0       17.0 4.2
Other comprehensive loss 5.0           4.9     4.9 0.1
Cash dividends declared on common stock (1) [2] (21.6)         (21.6)       (21.6)  
Distributions to noncontrolling interest (6.1)                   (6.1)
Stock-based compensation expense 6.5     6.5           6.5  
Settlement of share-based awards, net (6.4)     0.0       (6.4)   (6.4)  
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest, Ending Balance at Jun. 30, 2023 1,249.0   $ 0.8 5.9   971.0 17.6 $ (0.7)   994.6 254.4
Increase (Decrease) in Stockholders' Equity [Roll Forward]                      
Restricted shares, net, (in shares)     (1.0)         (0.3)      
Treasury Stock, Shares, Retired     (0.3)         (0.3)      
Retirement of treasury stock $ 0.0     (7.2)   0.0   $ (7.2)   0.0  
Common Stock, Dividends, Per Share, Declared $ 0.26                    
$0.01 Par Value $ 0.01                    
Common Stock, Shares, Issued     (81.8)         0.0      
Net income $ 23.6         21.8       21.8 1.8
Other comprehensive loss 0.2           0.1     0.1 0.1
Cash dividends declared on common stock (1) [2] (21.7)         (21.7)       (21.7)  
Distributions to noncontrolling interest (3.7)                   (3.7)
Stock-based compensation expense 6.1     6.1           6.1  
Settlement of share-based awards, net (0.1)     0.2       $ (0.3)   (0.1)  
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest, Ending Balance at Sep. 30, 2023 $ 1,253.4   $ 0.8 $ 12.2   $ 971.1 $ 17.7 $ (1.0)   $ 1,000.8 $ 252.6
Increase (Decrease) in Stockholders' Equity [Roll Forward]                      
Common Stock, Dividends, Per Share, Declared $ 0.26                    
$0.01 Par Value $ 0.01                    
Common Stock, Shares, Issued     (81.8)         0.0      
[1] Dividends of $0.23 per common share for all periods presented in 2022
[2] Dividends of $0.26 per common share for all periods presented in 2023.