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Consolidated Statement of Stockholders' Equity (unaudited) - USD ($)
$ in Millions
Total
Cumulative Effect, Period of Adoption, Adjustment
Common Stock
Capital in Excess of Par Value
Retained Earnings
Retained Earnings
Cumulative Effect, Period of Adoption, Adjustment
Accumulated Other Comprehensive Loss
Treasury Stock
Trinity Stockholders’ Equity
Trinity Stockholders’ Equity
Cumulative Effect, Period of Adoption, Adjustment
Noncontrolling Interest
Common Stock, Shares, Issued     (133,300,000)         (100,000)      
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest, Beginning Balance at Dec. 31, 2018 $ 2,562.0   $ 1.3 $ 1.2 $ 2,326.1   $ (116.8) $ (1.0) $ 2,210.8   $ 351.2
Increase (Decrease) in Stockholders' Equity [Roll Forward]                      
Net income (loss) 30.1       30.6       30.6   (0.5)
Other comprehensive (loss) income (3.8)           (4.1)   (4.1)   0.3
Cash dividends declared on common stock (1) [1] (22.3)       (22.3)       (22.3)    
Stock-based compensation expense $ 5.5     5.5         5.5    
Settlement of share-based awards, net               0      
Shares repurchased (866,715)             (3,500,000)      
Shares repurchased $ (19.0)     (70.0)       $ (89.0) (19.0)    
Settlement of share-based awards, net (0.5)     0.6       (1.1) (0.5)    
Distributions to noncontrolling interest (0.4)                   (0.4)
Cumulative effect of adopting new accounting standard   $ 13.7       $ 13.7       $ 13.7  
Other 0.2       (0.2)       (0.2)    
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest, Ending Balance at Mar. 31, 2019 $ 2,565.1   1.3 77.3 2,347.9   (120.9) (91.1) 2,214.5   350.6
Increase (Decrease) in Stockholders' Equity [Roll Forward]                      
Common Stock, Dividends, Per Share, Declared $ 0.17                    
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest, Beginning Balance at Dec. 31, 2018 $ 2,562.0   1.3 $ 1.2 2,326.1   (116.8) (1.0) 2,210.8   351.2
Increase (Decrease) in Stockholders' Equity [Roll Forward]                      
Net income (loss) 114.6                    
Other comprehensive (loss) income (12.7)                    
Stock-based compensation expense 21.4                    
Shares repurchased       (2,600,000)              
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest, Ending Balance at Sep. 30, 2019 2,459.3   $ 1.3 $ 0.0 2,342.1   (130.5) $ (102.3) 2,110.6   348.7
Common Stock, Shares, Issued     (133,300,000)         (3,600,000)      
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest, Beginning Balance at Mar. 31, 2019 2,565.1   $ 1.3 77.3 2,347.9   (120.9) $ (91.1) 2,214.5   350.6
Increase (Decrease) in Stockholders' Equity [Roll Forward]                      
Net income (loss) 36.8       36.4       36.4   0.4
Other comprehensive (loss) income (6.2)           (6.5)   (6.5)   0.3
Cash dividends declared on common stock (1) [1] (21.6)       (21.6)       (21.6)    
Stock-based compensation expense 7.5     7.5         7.5    
Settlement of share-based awards, net               500,000      
Shares repurchased               (2,133,116)      
Shares repurchased (44.0)     0.0       $ (44.0) (44.0)    
Settlement of share-based awards, net (7.5)   $ 0.7 1.0       $ (8.5) (7.5)    
Distributions to noncontrolling interest (0.5)                   (0.5)
Retirement of treasury stock     6,100,000         6,100,000      
Retirement of treasury stock 0.0     (85.8) (56.9)     $ (142.7) 0.0    
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest, Ending Balance at Jun. 30, 2019 $ 2,529.6   $ 1.3 0.0 2,305.8   (127.4) $ (0.9) 2,178.8   350.8
Increase (Decrease) in Stockholders' Equity [Roll Forward]                      
Common Stock, Dividends, Per Share, Declared $ 0.17                    
Common Stock, Shares, Issued     (127,900,000)         (100,000)      
$0.01 Par Value $ 0.01                    
Net income (loss) $ 47.7       49.0       49.0   (1.3)
Other comprehensive (loss) income (2.7)           (3.1)   (3.1)   0.4
Cash dividends declared on common stock (1) [1] (21.3)       (21.3)       (21.3)    
Stock-based compensation expense 8.4     8.4         8.4    
Settlement of share-based awards, net               0      
Shares repurchased               (5,171,489)      
Shares repurchased (100.9)     0.0       $ (100.9) (100.9)    
Settlement of share-based awards, net (0.3)     0.2       (0.5) (0.3)    
Distributions to noncontrolling interest (1.2)                   (1.2)
Retirement of treasury stock 0.0     (8.6) 8.6       0.0    
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest, Ending Balance at Sep. 30, 2019 $ 2,459.3   $ 1.3 0.0 2,342.1   (130.5) $ (102.3) 2,110.6   348.7
Increase (Decrease) in Stockholders' Equity [Roll Forward]                      
Common Stock, Dividends, Per Share, Declared $ 0.17                    
Common Stock, Shares, Issued     (127,900,000)         (5,300,000)      
$0.01 Par Value $ 0.01                    
Shares repurchased               (2,933,474)      
Shares repurchased               $ (60.8)      
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest, Ending Balance at Dec. 31, 2019 $ 2,378.9   $ 1.2 0.0 2,182.9   (153.1) $ (0.9) 2,030.1   348.8
Common Stock, Shares, Issued     (119,700,000)         100,000      
Increase (Decrease) in Stockholders' Equity [Roll Forward]                      
Net income (loss) 162.3       161.7       161.7   0.6
Other comprehensive (loss) income (23.2)           (23.5)   (23.5)   0.3
Cash dividends declared on common stock (1) [2] (24.6)       (24.6)       (24.6)    
Stock-based compensation expense 7.3     7.3         7.3    
Settlement of share-based awards, net               0      
Shares repurchased               (1,850,000)      
Shares repurchased (35.4)             $ (35.4) (35.4)    
Settlement of share-based awards, net (0.2)     0.7       (0.9) (0.2)    
Cumulative effect of adopting new accounting standard   $ 0.5       0.5       $ 0.5  
Other (0.5)       0.5       0.5    
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest, Ending Balance at Mar. 31, 2020 $ 2,466.1   $ 1.2 8.0 2,321.0   (176.6) (37.2) 2,116.4   349.7
Increase (Decrease) in Stockholders' Equity [Roll Forward]                      
Common Stock, Dividends, Per Share, Declared $ 0.19                    
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest, Beginning Balance at Dec. 31, 2019 $ 2,378.9   1.2 0.0 2,182.9   (153.1) (0.9) 2,030.1   348.8
Increase (Decrease) in Stockholders' Equity [Roll Forward]                      
Net income (loss) (99.6)                    
Other comprehensive (loss) income (10.5)                   0.9
Stock-based compensation expense 19.7                    
Cumulative effect of adopting new accounting standard           $ 0.7          
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest, Ending Balance at Sep. 30, 2020 2,093.6   $ 1.2 5.3 2,066.8   (164.5) $ (91.5) 1,817.3   276.3
Common Stock, Shares, Issued     (119,700,000)         2,000,000.0      
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest, Beginning Balance at Mar. 31, 2020 2,466.1   $ 1.2 8.0 2,321.0   (176.6) $ (37.2) 2,116.4   349.7
Increase (Decrease) in Stockholders' Equity [Roll Forward]                      
Net income (loss) (287.8)       (206.9)       (206.9)   (80.9)
Other comprehensive (loss) income 4.6           4.3   4.3   0.3
Cash dividends declared on common stock (1) [2] (20.6)       (20.6)       (20.6)    
Stock-based compensation expense 7.6     7.6         7.6    
Settlement of share-based awards, net     1,500,000         600,000      
Shares repurchased               0      
Shares repurchased               $ 0.0      
Settlement of share-based awards, net (9.5)     1.9       $ (11.4) (9.5)    
Retirement of treasury stock     2,500,000         2,500,000      
Retirement of treasury stock 0.0     (17.5) (30.2)     $ (47.7) 0.0    
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest, Ending Balance at Jun. 30, 2020 $ 2,160.4   $ 1.2 0.0 2,063.3   (172.3) $ (0.9) 1,891.3   269.1
Increase (Decrease) in Stockholders' Equity [Roll Forward]                      
Common Stock, Dividends, Per Share, Declared $ 0.19                    
Common Stock, Shares, Issued     (118,700,000)         100,000      
$0.01 Par Value $ 0.01                    
Net income (loss) $ 25.9       25.1       25.1   0.8
Other comprehensive (loss) income 8.1           7.8   7.8   0.3
Cash dividends declared on common stock (1) [2] (21.6)       (21.6)       (21.6)    
Stock-based compensation expense 4.8     4.8         4.8    
Settlement of share-based awards, net               0      
Shares repurchased               (4,466,896)      
Shares repurchased (89.9)             $ (89.9) (89.9)    
Settlement of share-based awards, net (0.2)     0.5       (0.7) (0.2)    
Contributions from noncontrolling interest 6.1                   6.1
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest, Ending Balance at Sep. 30, 2020 $ 2,093.6   $ 1.2 $ 5.3 $ 2,066.8   $ (164.5) $ (91.5) $ 1,817.3   $ 276.3
Increase (Decrease) in Stockholders' Equity [Roll Forward]                      
Common Stock, Dividends, Per Share, Declared $ 0.19                    
Common Stock, Shares, Issued     (118,700,000)         4,600,000      
$0.01 Par Value $ 0.01                    
[1] Dividends of $0.17 per common share for all periods presented in 2019.
[2] Dividends of $0.19 per common share for all periods presented in 2020.