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Earnings per Common Share - Textual (Details) - USD ($) $ / shares in Units, $ in Millions |  |  |  |  |  |  |  | 3 Months Ended | 6 Months Ended |
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Jul. 23, 2019 | Jul. 15, 2019 | May 03, 2019 | Apr. 15, 2019 | Feb. 21, 2019 | Jan. 15, 2019 | Oct. 26, 2018 | Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018 | Dec. 31, 2018
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 | $ 0.25 | $ 0.54 | $ 0.50 |
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 |  | $ 0.27 |  | $ 0.27 |  |  |  |  |
Cash dividends per common share, Paid (in dollars per share) |  |  |  | $ 0.27 |  | $ 0.27 |  |  |  |  |  |
Common stock dividends accrued |  |  |  |  |  |  |  | $ 27.8 |  | $ 27.8 |  | $ 28.4
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) | $ 0.28 |  |  |  |  |  |  |  |  |  |  |
Cash dividends per common share, Paid (in dollars per share) |  | $ 0.27 |  |  |  |  |  |  |  |  |  |

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- Definition Aggregate dividends paid during the period for each share of common stock outstanding. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -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://fasb.org/us-gaap/role/ref/legacyRef -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://fasb.org/us-gaap/role/ref/legacyRef -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 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section 45 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=118951113&loc=d3e6935-107765 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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