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Earnings per Common Share - Textual (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions |  |  |  |  |  | 1 Months Ended | 3 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Apr. 16, 2018 | Feb. 23, 2018 | Jan. 16, 2018 | Oct. 20, 2017 | Sep. 30, 2009 | Jan. 17, 2017 | Mar. 31, 2018 | Mar. 31, 2017 | Dec. 31, 2017 | Dec. 31, 2016
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items] |  |  |  |  |  |  |  |  |  |
Cash dividends per common share, Declared (in dollars per share) |  |  |  | $ 0.25 |  |  | $ 0.25 | $ 0.24 |  |
Stock warrants exercised (shares) |  |  |  |  | 5.0 | 0.7 |  |  |  |
Class of Warrant or Right, Outstanding |  |  |  |  | 8.2 | 0.0 |  |  |  | 8.2
Exercise price of warrants (in dollars per share) |  |  |  |  | $ 41.40 | $ 41.40 |  |  |  | $ 41.40
Proceeds from exercising stock warrants |  |  |  |  |  | $ 27.0 | $ 0.0 | $ 26.6 |  |
Common Stock |  |  |  |  |  |  |  |  |  |
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items] |  |  |  |  |  |  |  |  |  |
Cash dividends per common share, Declared (in dollars per share) |  | $ 0.25 |  |  |  |  |  |  |  |
Cash dividends per common share, Paid (in dollars per share) |  |  | $ 0.25 |  |  |  |  |  |  |
Common stock dividends accrued |  |  |  |  |  |  | $ 25.8 |  | $ 25.4 |
Subsequent Event [Member] | Common Stock |  |  |  |  |  |  |  |  |  |
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items] |  |  |  |  |  |  |  |  |  |
Cash dividends per common share, Paid (in dollars per share) | $ 0.25 |  |  |  |  |  |  |  |  |

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- Definition The stock warrants exercises resulted in the issuance of shares of common stock. + References No definition available. + Details
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- Definition Exercise price per share or per unit of warrants or rights outstanding. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(i)(4)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
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- Definition Number of warrants or rights outstanding. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(i)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
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- Definition Aggregate dividends paid during the period for each share of common stock outstanding. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 + Details
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- Definition Aggregate dividends declared during the period for each share of common stock outstanding. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 + Details
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- Definition Carrying value as of the balance sheet date of dividends declared but unpaid on equity securities issued by the entity and outstanding. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section 45 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=82887183&loc=d3e6935-107765 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.20) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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