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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
--- | --- | --- | --- | --- | --- | --- | ---
Increase (Decrease) in Shareholders' Equity |  |  |  |  |  |  |  |
Adoption of accounting standards | Adjustments for New Accounting Pronouncement |  | $ 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 |  |  | 61,800,000 |  |  |  |  | 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 |  | (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 and deferrals. net for stock based compensation (1) | [1] | 11.1 |  | 12.1 | (2.6) |  |  | $ 1.6
Issuances and deferrals, net 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 |  |  | 59,800,000 |  |  |  |  | 18,600,000
Balance at the beginning of the period at Mar. 31, 2018 |  | 2,720.8 | $ 78.7 | 357.6 | 11.1 | (68.9) | 3,120.3 | $ (778.0)
Balance (in shares) at Mar. 31, 2018 |  |  | 60,700,000 |  |  |  |  | 17,700,000
Increase (Decrease) in Shareholders' Equity |  |  |  |  |  |  |  |
Net income |  | 113.7 |  |  |  |  | 113.7 |
Other comprehensive income (loss), net of tax |  | (34.0) |  |  |  | (34.0) |  |
Cash dividends |  | (22.5) |  |  |  |  | (22.5) |
Repurchases of common stock |  | (111.3) |  |  |  |  |  | $ (111.3)
Repurchases of common stock (in shares) |  |  | (1,000,000.0) |  |  |  |  | 1,000,000.0
Issuances and deferrals. net for stock based compensation (1) |  | 5.6 |  | 8.2 | (3.3) |  |  | $ 0.7
Issuances and deferrals, net for stock based compensation (in shares) |  |  | 100,000 |  |  |  |  | (100,000)
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 |  |  | 59,800,000 |  |  |  |  | 18,600,000
Balance at the beginning of the period at Dec. 31, 2018 |  | $ 2,597.4 | $ 78.7 | 383.8 | $ 8.0 | (122.1) | 3,351.4 | $ (1,102.4)
Balance (in shares) at Dec. 31, 2018 |  | 57,957,912 | 57,900,000 |  |  |  |  | 20,500,000
Increase (Decrease) in Shareholders' Equity |  |  |  |  |  |  |  |
Net income |  | $ 232.3 |  |  |  |  | 232.3 |
Other comprehensive income (loss), net of tax |  | 1.6 |  |  |  | 1.6 |  |
Cash dividends |  | (46.2) |  |  |  |  | (46.2) |
Repurchases of common stock |  | (224.9) |  |  |  |  |  | $ (224.9)
Repurchases of common stock (in shares) |  |  | (1,900,000) |  |  |  |  | 1,900,000
Issuances and deferrals. net for stock based compensation (1) | [1] | 23.0 |  | 13.5 |  |  |  | $ 14.5
Issuances and deferrals, net for stock based compensation (in shares) | [1] |  | 400,000 |  | (5,000,000.0) |  |  | (400,000)
Balance at the end of the period at Jun. 30, 2019 |  | $ 2,583.2 | $ 78.7 | 397.3 | $ 3.0 | (120.5) | 3,537.5 | $ (1,312.8)
Balance (in shares) at Jun. 30, 2019 |  | 56,420,192 | 56,400,000 |  |  |  |  | 22,000,000.0
Balance at the beginning of the period at Mar. 31, 2019 |  | $ 2,524.7 | $ 78.7 | 390.1 | 7.8 | (115.9) | 3,407.5 | $ (1,243.5)
Balance (in shares) at Mar. 31, 2019 |  |  | 56,800,000 |  |  |  |  | 21,600,000
Increase (Decrease) in Shareholders' Equity |  |  |  |  |  |  |  |
Net income |  | 152.9 |  |  |  |  | 152.9 |
Other comprehensive income (loss), net of tax |  | (4.6) |  |  |  | (4.6) |  |
Cash dividends |  | (22.9) |  |  |  |  | (22.9) |
Repurchases of common stock |  | (75.0) |  |  |  |  |  | $ (75.0)
Repurchases of common stock (in shares) |  |  | (600,000) |  |  |  |  | 600,000
Issuances and deferrals. net for stock based compensation (1) |  | 8.1 |  | 7.2 | (4.8) |  |  | $ 5.7
Issuances and deferrals, net for stock based compensation (in shares) |  |  | 200,000 |  |  |  |  | (200,000)
Balance at the end of the period at Jun. 30, 2019 |  | $ 2,583.2 | $ 78.7 | $ 397.3 | $ 3.0 | $ (120.5) | $ 3,537.5 | $ (1,312.8)
Balance (in shares) at Jun. 30, 2019 |  | 56,420,192 | 56,400,000 |  |  |  |  | 22,000,000.0
[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.

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