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Condensed Consolidated Statement of Shareholders' Equity (Unaudited) - USD ($) $ in Millions | Total | Common Stock | Additional Paid-In Capital | Deferred Compensation Equity | Accumulated Other Comprehensive Income (loss). | Retained Earnings | Shares in Treasury
--- | --- | --- | --- | --- | --- | --- | ---
Balance at the beginning of the period at Dec. 31, 2016 |  | $ 2,466.9 | $ 78.7 | $ 335.3 | $ 10.3 | $ (122.2) | $ 2,547.4 | $ (382.6)
Balance (in shares) at Dec. 31, 2016 |  |  | 64,300,000 |  |  |  |  | 14,200,000
Increase (Decrease) in Shareholders' Equity |  |  |  |  |  |  |  |
Net income |  | 164.1 |  |  |  |  | 164.1 |
Other comprehensive income (loss), net of tax |  | 31.3 |  |  |  | 31.3 |  |
Cash dividends - $0.74 and $0.70 for the six months ended June 30, 2018 and 2017, respectively |  | (45.8) |  |  |  |  | (45.8) |
Repurchases of common stock |  | (150.0) |  |  |  |  |  | $ (150.0)
Repurchases of common stock (in shares) |  |  | (1,500,000) |  |  |  |  | 1,500,000
Issuances for stock based compensation (1) | [1] | 6.0 |  | 6.3 | 2.8 |  |  | $ (3.1)
Issuances for stock based compensation (in shares) | [1] |  | 200,000 |  |  |  |  | (200,000)
Balance at the end of the period at Jun. 30, 2017 |  | 2,472.5 | $ 78.7 | 341.6 | 13.1 | (90.9) | 2,665.7 | $ (535.7)
Balance (in shares) at Jun. 30, 2017 |  |  | 63,000,000.0 |  |  |  |  | 15,500,000
Increase (Decrease) in Shareholders' Equity |  |  |  |  |  |  |  |
Adoption of accounting standards | Adjustments for New Accounting Pronouncement | [2] | 6.5 |  |  |  | (6.5) | 13.0 |
Balance at the beginning of the period at Dec. 31, 2017 |  | $ 2,528.3 | $ 78.7 | 353.7 | 10.4 | (85.7) | 2,820.8 | $ (649.6)
Balance (in shares) at Dec. 31, 2017 |  | 61,839,734 | 61,800,000 |  |  |  |  | 16,600,000
Increase (Decrease) in Shareholders' Equity |  |  |  |  |  |  |  |
Net income |  | $ 423.3 |  |  |  |  | 423.3 |
Other comprehensive income (loss), net of tax |  | (10.7) |  |  |  | (10.7) |  |
Cash dividends - $0.74 and $0.70 for the six months ended June 30, 2018 and 2017, respectively |  | (45.6) |  |  |  |  | (45.6) |
Repurchases of common stock |  | (240.6) |  |  |  |  |  | $ (240.6)
Repurchases of common stock (in shares) |  |  | (2,200,000) |  |  |  |  | 2,200,000
Issuances for stock based compensation (1) | [1] | 11.1 |  | 12.1 | (2.6) |  |  | $ 1.6
Issuances for stock based compensation (in shares) | [1] |  | 200,000 |  |  |  |  | (200,000)
Balance at the end of the period at Jun. 30, 2018 |  | $ 2,672.3 | $ 78.7 | $ 365.8 | $ 7.8 | $ (102.9) | $ 3,211.5 | $ (888.6)
Balance (in shares) at Jun. 30, 2018 |  | 59,817,890 | 59,800,000 |  |  |  |  | 18,600,000
[1] | Issuances and deferrals, net for stock based compensation reflects share activity related to option exercises, restricted and performance shares vested and net issuances and deferrals associated with deferred compensation equity.
[2] | Refer to Note 2 for further information regarding new accounting standards adopted.

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