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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
--- | --- | --- | --- | --- | --- | --- | --- | ---
Common Stock, Shares, Issued |  | (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 |  |  |  |  |  | (1,500,000) |  |
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 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 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 | 135.4 |  |  |  |  |  |  |
Other comprehensive (loss) income | 3.5 |  |  |  |  |  |  |
Stock-based compensation | 21.8 |  |  |  |  |  |  |
Shares repurchased, shares |  |  |  |  |  | (4,327,158) |  |
Shares repurchased | (150.1) |  |  |  |  |  |  |
Ending balance at Sep. 30, 2018 | 4,643.4 | $ 1.5 | 250.2 | 4,216.1 | (121.1) | $ (54.4) | 4,292.3 | 351.1
Common Stock, Shares, Issued |  | (150,900,000) |  |  |  | (1,700,000) |  |
Beginning balance at Mar. 31, 2018 | 4,834.6 | $ 1.6 | 492.7 | 4,162.9 | (122.0) | $ (53.5) | 4,481.7 | 352.9
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |
Net income | 65.5 |  |  | 64.1 |  |  | 64.1 | 1.4
Other comprehensive (loss) income | (0.5) |  |  |  | (0.9) |  | (0.9) | 0.4
Dividends, Common Stock, Cash | (19.6) |  |  | (19.6) |  |  | (19.6) |
Stock-based compensation | 8.0 |  | 8.0 |  |  |  | 8.0 |
Restricted shares, net, (in shares) |  | 200,000 |  |  |  | (300,000) |  |
Shares repurchased, shares |  |  |  |  |  | (1,500,000) |  |
Shares repurchased | (50.1) |  |  |  |  | $ (50.1) | (50.1) |
Stock Issued During Period, Value, Restricted Stock Award, Net of Forfeitures | (8.6) |  | 4.2 |  |  | $ (12.8) | (8.6) |
Distributions to noncontrolling interest | (4.5) |  |  |  |  |  | 0.0 | (4.5)
Treasury Stock, Shares, Retired |  | (3,400,000) |  |  |  | 3,400,000 |  |
Treasury Stock, Retired, Cost Method, Amount | 0.0 |  | (114.8) |  |  | $ 114.8 | 0.0 |
Adjustments to Additional Paid in Capital, Equity Component of Convertible Debt | (152.9) |  | (152.9) |  |  |  | (152.9) |
Stockholders' equity, other | (0.1) | $ (0.1) |  |  |  |  | (0.1) |
Ending balance at Jun. 30, 2018 | 4,671.8 | $ 1.5 | 237.2 | 4,207.4 | (122.9) | $ (1.6) | 4,321.6 | 350.2
Common Stock, Shares, Issued |  | (147,700,000) |  |  |  | (100,000) |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |
Net income | 28.3 |  |  | 27.7 |  |  | 27.7 | 0.6
Other comprehensive (loss) income | 2.1 |  |  |  | 1.8 |  | 1.8 | 0.3
Dividends, Common Stock, Cash | (19.0) |  |  | (19.0) |  |  | (19.0) |
Stock-based compensation | 7.6 |  | 7.6 |  |  |  | 7.6 |
Restricted shares, net, (in shares) |  |  |  |  |  | 0 |  |
Shares repurchased, shares |  |  |  |  |  | (1,356,484) |  |
Shares repurchased | (50.0) |  |  |  |  | $ (50.0) | (50.0) |
Stock Issued During Period, Value, Restricted Stock Award, Net of Forfeitures | 2.6 |  | 5.4 |  |  | (2.8) | 2.6 |
Ending balance at Sep. 30, 2018 | 4,643.4 | $ 1.5 | 250.2 | 4,216.1 | (121.1) | $ (54.4) | 4,292.3 | 351.1
Common Stock, Shares, Issued |  | (147,700,000) |  |  |  | (1,500,000) |  |
Common Stock, Shares, Issued |  | (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 |  |  |  |  |  | (3,500,000) |  |
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) |  |  | (0.2) |  |  | (0.2) |
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
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 | 114.6 |  |  |  |  |  |  |
Other comprehensive (loss) income | (12.7) |  |  |  |  |  |  | 1.0
Stock-based compensation | 21.4 |  |  |  |  |  |  |
Shares repurchased, shares |  |  | (2,607,172) |  |  | (10,778,492) |  |
Shares repurchased |  |  | $ (70.0) |  |  | $ (233.9) |  |
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) |  |
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 | 36.8 |  |  | 36.4 |  |  | 36.4 | 0.4
Other comprehensive (loss) income | (6.2) |  |  |  | (6.5) |  | (6.5) | 0.3
Dividends, Common Stock, Cash | (21.6) |  |  | (21.6) |  |  | (21.6) |
Stock-based compensation | 7.5 |  | 7.5 |  |  |  | 7.5 |
Restricted shares, net, (in shares) |  | 700,000 |  |  |  | (500,000) |  |
Shares repurchased, shares |  |  |  |  |  | (2,100,000) |  |
Shares repurchased | (44.0) |  |  |  |  | $ (44.0) | (44.0) |
Stock Issued During Period, Value, Restricted Stock Award, Net of Forfeitures | (7.5) |  | 1.0 |  |  | $ (8.5) | (7.5) |
Distributions to noncontrolling interest | (0.5) |  |  |  |  |  | 0.0 | (0.5)
Treasury Stock, Shares, Retired |  | (6,100,000) |  |  |  | 6,100,000 |  |
Treasury Stock, Retired, Cost Method, Amount | 0.0 |  | (85.8) | (56.9) |  | $ (142.7) | 0.0 |
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
Common Stock, Shares, Issued |  | (127,900,000) |  |  |  | (100,000) |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |
Net income | 47.7 |  |  | 49.0 |  |  | 49.0 | (1.3)
Other comprehensive (loss) income | (2.7) |  |  |  | (3.1) |  | (3.1) | 0.4
Dividends, Common Stock, Cash | (21.3) |  |  | (21.3) |  |  | (21.3) |
Stock-based compensation | 8.4 |  | 8.4 |  |  |  | 8.4 |
Restricted shares, net, (in shares) |  | 0 |  |  |  | 0 |  |
Shares repurchased, shares |  |  |  |  |  | (5,171,489) |  |
Shares repurchased | (100.9) |  | (8.6) | 8.6 |  | $ (100.9) | (100.9) |
Stock Issued During Period, Value, Restricted Stock Award, Net of Forfeitures | (0.3) |  | 0.2 |  |  | (0.5) | (0.3) |
Distributions to noncontrolling interest | (1.2) |  |  |  |  |  | 0.0 | (1.2)
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 |  | (127,900,000) |  |  |  | (5,300,000) |  |

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- Definition Amount of decrease of par value, additional paid in capital (APIC) and retained earnings of common and preferred stock retired from treasury when treasury stock is accounted for under the cost method. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21463-112644 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(29)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 + Details
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- Definition Number of shares that have been repurchased during the period and are being held in treasury. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21463-112644 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(29)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Number of shares of common and preferred stock retired from treasury during the period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(29)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21463-112644 + Details
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- Definition Equity impact of the cost of common and preferred stock that were repurchased during the period. Recorded using the cost method. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21463-112644 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6405813&loc=d3e23239-112655 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 + Details
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