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Condensed Consolidated Statements of Changes in Stockholders' Equity - USD ($) $ in Millions | Total | Common Stock Issued [Member] | Additional Paid-in Capital [Member] | Retained Earnings [Member] | Accumulated Other Comprehensive Loss [Member]
--- | --- | --- | --- | --- | ---
Balance at Dec. 31, 2013 | $ 561.4 | $ 3.1 | $ 43.3 | $ 520.0 | $ (5.0)
Balance (in shares) at Dec. 31, 2013 |  | 31,423,427 |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Net income | 71.2 |  |  | 71.2 |
Other comprehensive income (loss), net of tax | (31.1) |  |  |  | (31.1)
Dividends declared ($1.08 per share in 2014 and $1.14 per share in 2015) | (33.0) |  |  | (33.0) |
Restricted stock issuances, net | 0.0 | $ 0.0 | 0.0 |  |
Restricted stock issuances, net (in shares) |  | 198,180 |  |  |
Stock-based employee compensation expense | 4.3 |  | 4.3 |  |
Excess tax benefits of stock-based employee compensation | 0.6 |  | 0.6 |  |
Stock issued to directors as compensation | 0.1 | $ 0.0 | 0.1 |  |
Stock Repurchased and Retired During Period, Shares |  | 1,161,812 |  |  |
Stock issued to directors as compensation (in shares) |  | 1,996 |  |  |
Purchases and retirement of common stock | (52.6) | $ (0.1) |  | (52.5) |
Balance at Sep. 30, 2014 | 520.9 | $ 3.0 | 48.3 | 505.7 | (36.1)
Balance (in shares) at Sep. 30, 2014 |  | 30,461,791 |  |  |
Balance at Dec. 31, 2014 | 489.0 | $ 3.0 | 49.8 | 512.7 | (76.5)
Balance (in shares) at Dec. 31, 2014 |  | 30,465,522 |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Net income | 68.0 |  |  | 68.0 |
Other comprehensive income (loss), net of tax | (61.7) |  |  |  | (61.7)
Dividends declared ($1.08 per share in 2014 and $1.14 per share in 2015) | (34.7) |  |  | (34.7) |
Restricted stock issuances, net | 0.0 | $ 0.0 | 0.0 |  |
Restricted stock issuances, net (in shares) |  | 70,949 |  |  |
Stock-based employee compensation expense | 1.7 |  | 1.7 |  |
Excess tax benefits of stock-based employee compensation | 0.5 |  | 0.5 |  |
Stock issued to directors as compensation | 0.1 | $ 0.0 | 0.1 |  |
Stock Repurchased and Retired During Period, Shares |  | 63,365 |  |  |
Stock issued to directors as compensation (in shares) |  | 2,638 |  |  |
Purchases and retirement of common stock | (2.9) | $ 0.0 |  | (2.9) |
Balance at Sep. 30, 2015 | $ 460.0 | $ 3.0 | $ 52.1 | $ 543.1 | $ (138.2)
Balance (in shares) at Sep. 30, 2015 |  | 30,475,744 |  |  |

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