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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 | 6 Months Ended |  |
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Jul. 24, 2018 | Jul. 16, 2018 | May 04, 2018 | Apr. 16, 2018 | Feb. 23, 2018 | Jan. 16, 2018 | Oct. 20, 2017 | Sep. 30, 2009 | Jan. 17, 2017 | Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 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 | $ 0.50 | $ 0.48 |  |
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 |  | $ 0.25 |  |  |  |  |  |  |  |  |  |
Cash dividends per common share, Paid (in dollars per share) |  |  |  | $ 0.25 |  | $ 0.25 |  |  |  |  |  |  |  |  |
Common stock dividends accrued |  |  |  |  |  |  |  |  |  | $ 26.0 |  | $ 26.0 |  | $ 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, Declared (in dollars per share) | $ 0.27 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash dividends per common share, Paid (in dollars per share) |  | $ 0.25 |  |  |  |  |  |  |  |  |  |  |  |  |

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- Definition Exercise price per share or per unit of warrants or rights outstanding. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -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://fasb.org/us-gaap/role/ref/legacyRef -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 The cash inflow associated with the amount received from holders exercising their stock warrants. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3255-108585 + Details
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