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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

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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

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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

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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

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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

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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
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-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.20)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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The cash inflow associated with the amount received from holders exercising their stock warrants.

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