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Shareholders' Equity (Tables) | 6 Months Ended
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Jun. 30, 2019 | Jun. 30, 2018
Equity [Abstract] |  |
Schedule of Stockholders Equity [Table Text Block] | The following table presents the changes in shareholders’ equity for the six months ended June 30, 2019:
| Common Shares Issued |  | Common Stock |  | Capital in Excess of Par Value |  | Number of Treasury Shares |  | Treasury Stock |  | Retained earnings |  | Accumulated other comprehensive loss |  | Total
($ in millions) |  |  |  |  |  |  |
Balance, December 31, 2018 | 75.3 |  |  | $ | 18.8 |  |  | $ | 282.0 |  |  | 1.2 |  |  | $ | (103.7 | ) |  | $ | 1,353.4 |  |  | $ | (154.2 | ) |  | $ | 1,396.3 |
Net income | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | 55.4 |  |  | — |  |  | 55.4 |
Activity related to stock-based compensation | — |  |  | — |  |  | (3.5 | ) |  | (0.2 | ) |  | 14.2 |  |  | — |  |  | — |  |  | 10.7 |
Shares purchased under share repurchase program | — |  |  | — |  |  | — |  |  | 0.8 |  |  | (83.1 | ) |  | — |  |  | — |  |  | (83.1 | )
Dividends declared ($0.15 per share) | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | (10.6 | ) |  | — |  |  | (10.6 | )
Other comprehensive income, net of tax | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | 0.8 |  |  | 0.8 |
Balance, March 31, 2019 | 75.3 |  |  | $ | 18.8 |  |  | $ | 278.5 |  |  | 1.8 |  |  | $ | (172.6 | ) |  | $ | 1,398.2 |  |  | $ | (153.4 | ) |  | $ | 1,369.5 |
Net income | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | 66.1 |  |  | — |  |  | 66.1 |
Activity related to stock-based compensation | — |  |  | — |  |  | (5.1 | ) |  | (0.2 | ) |  | 24.8 |  |  | — |  |  | — |  |  | 19.7 |
Dividends declared ($0.15 per share) | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | (11.4 | ) |  | — |  |  | (11.4 | )
Other comprehensive income, net of tax | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | 1.2 |  |  | 1.2 |
Balance, June 30, 2019 | 75.3 |  |  | $ | 18.8 |  |  | $ | 273.4 |  |  | 1.6 |  |  | $ | (147.8 | ) |  | $ | 1,452.9 |  |  | $ | (152.2 | ) |  | $ | 1,445.1 |
| The following table presents the changes in shareholders’ equity for the six months ended June 30, 2018:
| Common Shares Issued |  | Common Stock |  | Capital in Excess of Par Value |  | Number of Treasury Shares |  | Treasury Stock |  | Retained earnings |  | Accumulated other comprehensive loss |  | Total
($ in millions) |  |  |  |  |  |  |
Balance, December 31, 2017 | 75.2 |  |  | $ | 18.8 |  |  | $ | 309.3 |  |  | 1.3 |  |  | $ | (109.1 | ) |  | $ | 1,178.2 |  |  | $ | (117.3 | ) |  | $ | 1,279.9 |
Effect of modified retrospective application of a new accounting standard | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | 11.4 |  |  | — |  |  | 11.4 |
Net income | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | 43.6 |  |  | — |  |  | 43.6 |
Activity related to stock-based compensation | 0.1 |  |  | — |  |  | (0.8 | ) |  | (0.1 | ) |  | 8.0 |  |  | — |  |  | — |  |  | 7.2 |
Shares purchased under share repurchase program | — |  |  | — |  |  | — |  |  | 0.5 |  |  | (47.9 | ) |  | — |  |  | — |  |  | (47.9 | )
Dividends declared ($0.14 per share) | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | (10.4 | ) |  | — |  |  | (10.4 | )
Other comprehensive income, net of tax | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | 21.5 |  |  | 21.5 |
Balance, March 31, 2018 | 75.3 |  |  | $ | 18.8 |  |  | $ | 308.5 |  |  | 1.7 |  |  | $ | (149.0 | ) |  | $ | 1,222.8 |  |  | $ | (95.8 | ) |  | $ | 1,305.3 |
Net income | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | 56.1 |  |  | — |  |  | 56.1 |
Activity related to stock-based compensation | — |  |  | — |  |  | (3.8 | ) |  | (0.2 | ) |  | 16.0 |  |  | — |  |  | — |  |  | 12.2 |
Shares purchased under share repurchase program | — |  |  | — |  |  | — |  |  | 0.3 |  |  | (22.9 | ) |  | — |  |  | — |  |  | (22.9 | )
Dividends declared ($0.14 per share) | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | (20.9 | ) |  | — |  |  | (20.9 | )
Other comprehensive loss, net of tax | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | (47.9 | ) |  | (47.9 | )
Balance, June 30, 2018 | 75.3 |  |  | $ | 18.8 |  |  | $ | 304.7 |  |  | 1.8 |  |  | $ | (155.9 | ) |  | $ | 1,258.0 |  |  | $ | (143.7 | ) |  | $ | 1,281.9 |

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- Definition Tabular disclosure of changes in the separate accounts comprising stockholders' equity (in addition to retained earnings) and of the changes in the number of shares of equity securities during at least the most recent annual fiscal period and any subsequent interim period presented is required to make the financial statements sufficiently informative if both financial position and results of operations are presented. + 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 + Details
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