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Earnings Per Common Share - Textual (Details) - USD ($) $ / shares in Units, $ in Millions |  |  |  |  |  |  |  |  |  |  |  |  |  | 1 Months Ended | 12 Months Ended |  |  |
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Feb. 23, 2018 | Jan. 16, 2018 | Oct. 20, 2017 | Oct. 16, 2017 | Jul. 20, 2017 | Oct. 17, 2016 | Jul. 21, 2016 | Oct. 15, 2015 | Jul. 16, 2015 | Apr. 22, 2015 | Oct. 15, 2014 | Jul. 17, 2014 | Sep. 30, 2009 | Jan. 17, 2017 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Apr. 23, 2015 | Feb. 14, 2014 | Dec. 31, 2013
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Antidilutive shares excluded from computation of diluted weighted-average shares (shares) |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 200,000 | 100,000 |  |  |  |
Common stock repurchased |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 38.1 | $ 65.6 | $ 45.3 |  |  |
Cash dividends declared per common share (in dollars per share) |  |  | $ 0.25 |  | $ 0.25 |  | $ 0.24 |  | $ 0.23 |  |  | $ 0.21 |  |  | $ 0.98 | $ 0.94 | $ 0.88 |  |  |
Cash dividends paid per common share (dollars per share) |  |  |  | $ 0.25 |  | $ 0.24 |  | $ 0.23 |  |  | $ 0.21 |  |  |  |  |  |  |  |  |
Preferred stock conversion rate (shares for each share) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 33.9905 |  |
Common stock, par value (in dollars per share) |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 0.01 | $ 0.01 |  | $ 0.01 |  |
Common stock issued (shares) |  |  |  |  |  |  |  |  |  |  |  |  | 5,000,000 | 700,000 |  |  |  |  |  |
Common stock warrants issued |  |  |  |  |  |  |  |  |  |  |  |  | 8,200,000 | 0 |  | 8,200,000 |  |  |  |
Exercise price of warrants (in dollars per share) |  |  |  |  |  |  |  |  |  |  |  |  | $ 41.40 | $ 41.40 |  | $ 41.40 |  |  |  |
Proceeds from exercising stock warrants |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 26.7 | $ 26.6 | $ 0.0 | $ 0.0 |  |  |
Subsequent Event [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash dividends declared per common share (in dollars per share) | $ 0.25 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash dividends paid per common share (dollars per share) |  | $ 0.25 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock repurchase authorization |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 250.0 | $ 200.0
Common stock repurchased (shares) |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 900,000 | 1,700,000 | 1,300,000 |  |  |
Common stock repurchased |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 38.1 | $ 65.6 | $ 45.3 |  |  |
Accrued common stock dividends |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 25.4 | $ 22.2 |  |  |  |
Common stock issued and delivered (shares) |  |  |  |  |  |  |  |  |  | 3,271,415 |  |  |  |  |  |  |  |  |  |
Convertible Preferred Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Convertible preferred stock par value (in dollars per share) |  |  |  |  |  |  |  |  |  | $ 0.10 |  |  |  |  |  |  |  |  |  |
Preferred stock liquidation preference (in dollars per share) |  |  |  |  |  |  |  |  |  | $ 1,000 |  |  |  |  |  |  |  |  |  |
Preferred stock outstanding (shares) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 96,245 |  |

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