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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 Income (Loss) [Member]
--- | --- | --- | --- | --- | ---
Balance (in shares) at Dec. 31, 2014 |  | 30,465,522 |  |  |
Balance at Dec. 31, 2014 | $ 489.0 | $ 3.0 | $ 49.8 | $ 512.7 | $ (76.5)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Net income | 89.7 |  |  | 89.7 |
Other comprehensive loss, net of tax | (64.9) |  |  |  | (64.9)
Dividends declared | (46.9) |  |  | (46.9) |
Restricted stock issuances, net (in shares) |  | 68,264 |  |  |
Restricted stock issuances, net | 0.0 | $ 0.0 | 0.0 |  |
Stock-based employee compensation expense | 3.3 |  | 3.3 |  |
Adjustment to Additional Paid in Capital, Income Tax Effect from Share-based Compensation, Net |  |  | 0.5 |  |
Excess tax deficit of stock-based employee compensation | 0.5 |  |  |  |
Stock issued to directors as compensation (in shares) |  | 3,728 |  |  |
Stock issued to directors as compensation | 0.1 | $ 0.0 | 0.1 |  |
Purchases and cancellation of common stock | (2.9) |  |  |  |
Purchases and cancellation of common stock (in shares) |  | (63,365) |  |  |
Purchases and cancellation of common stock |  | $ 0.0 |  | (2.9) |
Balance (in shares) at Dec. 31, 2015 |  | 30,474,149 |  |  |
Balance at Dec. 31, 2015 | 467.9 | $ 3.0 | 53.7 | 552.6 | (141.4)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Net income | 82.8 |  |  | 82.8 |
Other comprehensive loss, net of tax | 2.1 |  |  |  | 2.1
Dividends declared | (49.4) |  |  | (49.4) |
Restricted stock issuances, net (in shares) |  | 84,105 |  |  |
Restricted stock issuances, net | 0.1 | $ 0.1 | 0.0 |  |
Stock-based employee compensation expense | 5.5 |  | 5.5 |  |
Adjustments to Additional Paid in Capital, Income Tax Deficiency from Share-based Compensation | (0.2) |  | (0.2) |  |
Stock issued to directors as compensation (in shares) |  | 6,585 |  |  |
Stock issued to directors as compensation | 0.2 | $ 0.0 | 0.2 |  |
Purchases and cancellation of common stock (in shares) |  | (20,345) |  |  |
Purchases and cancellation of common stock | (0.7) | $ 0.0 |  | (0.7) |
Balance (in shares) at Dec. 31, 2016 |  | 30,544,494 |  |  |
Balance at Dec. 31, 2016 | 508.3 | $ 3.1 | 59.2 | 585.3 | (139.3)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Net income | 34.5 |  |  | 34.5 |
Other comprehensive loss, net of tax | 49.9 |  |  |  | 49.9
Dividends declared | (51.9) |  |  | (51.9) |
Restricted stock issuances, net (in shares) |  | 186,867 |  |  |
Restricted stock issuances, net | 0.0 | $ 0.0 | 0.0 |  |
Stock-based employee compensation expense | 6.9 |  | 6.9 |  |
Stock issued to directors as compensation (in shares) |  | 5,798 |  |  |
Stock issued to directors as compensation | 0.2 | $ 0.0 | 0.2 |  |
Purchases and cancellation of common stock (in shares) |  | (25,860) |  |  |
Purchases and cancellation of common stock | (1.2) | $ 0.0 |  | (1.2) |
Balance (in shares) at Dec. 31, 2017 |  | 30,711,299 |  |  |
Balance at Dec. 31, 2017 | $ 546.7 | $ 3.1 | $ 66.3 | $ 566.7 | $ (89.4)

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