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Consolidated Statement of Stockholders' Equity (unaudited) - USD ($)
$ in Millions
Total
Common Stock
Capital in Excess of Par Value
Retained Earnings
Accumulated Other Comprehensive Loss
Treasury Stock
Trinity Stockholders’ Equity
Noncontrolling Interest
Beginning balance (in shares) at Dec. 31, 2017   (150,900,000)       (100,000)    
Beginning balance at Dec. 31, 2017 $ 4,858.0 $ 1.6 $ 482.5 $ 4,123.4 $ (104.8) $ (1.6) $ 4,501.1 $ 356.9
Increase (Decrease) in Stockholders' Equity [Roll Forward]                
Net income 41.6     40.2     40.2 1.4
Other comprehensive (loss) income 1.9       1.5   1.5 0.4
Dividends, Common Stock, Cash 19.4     19.4     19.4  
Stock-based compensation 6.2   6.2       6.2  
Restricted shares, net, (in shares)           (100,000)    
Shares repurchased, shares           (1,519,503)    
Shares repurchased (50.0)         $ 50.0 (50.0)  
Stock options exercised 0.1   0.1       0.1  
Stock Issued During Period, Value, Restricted Stock Award, Net of Forfeitures 2.0   3.9     $ (1.9) 2.0  
Distributions to noncontrolling interest (5.8)           0.0 (5.8)
Cumulative effect of new accounting principle 0.0     18.7 (18.7)   0.0  
Ending balance (in shares) at Mar. 31, 2018   (150,900,000)       (1,700,000)    
Ending balance at Mar. 31, 2018 4,834.6 $ 1.6 492.7 4,162.9 (122.0) $ (53.5) 4,481.7 352.9
Beginning balance (in shares) at Dec. 31, 2018   (133,300,000)       (100,000)    
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 30.1     30.6     30.6 (0.5)
Other comprehensive (loss) income (3.8)       (4.1)   (4.1) 0.3
Dividends, Common Stock, Cash 22.3     22.3     22.3  
Stock-based compensation 5.5   $ 5.5       5.5  
Shares repurchased, shares     (2,607,172)     (3,473,887)    
Shares repurchased (19.0)   $ 70.0     $ 89.0 (19.0)  
Stock Issued During Period, Value, Restricted Stock Award, Net of Forfeitures (0.5)   0.6     (1.1) (0.5)  
Distributions to noncontrolling interest (0.4)           0.0 (0.4)
Cumulative effect of new accounting principle 13.7     13.7     13.7  
Stockholders' equity, other (0.2) $ 0.0 0.0 (0.2)   $ 0.0 (0.2) 0.0
Ending balance (in shares) at Mar. 31, 2019   (133,300,000)       (3,600,000)    
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