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Earnings Per Common Share - Textual (Details) - USD ($)					1 Months Ended				12 Months Ended
	Jul. 24, 2018	Jul. 20, 2017	Jul. 21, 2016	Sep. 30, 2009	Jan. 31, 2020	Oct. 31, 2019	Jul. 31, 2019	Jan. 17, 2017	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Feb. 28, 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)									100,000	0	200,000
Common stock repurchased									$ 45,900,000		$ 38,100,000
Cash dividends declared per common share (in dollars per share)									$ 1.1	$ 1.04	$ 0.98
Common stock issued (shares)				5,000,000.0				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								$ 26,700,000	$ 0	$ 0	$ 26,600,000
Common Stock
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items]
Common stock repurchase authorization	$ 250,000,000												$ 250,000,000	$ 200,000,000
Common stock repurchased (shares)									800,000	0	900,000
Common stock repurchased									$ 45,900,000		$ 38,100,000
Cash dividends declared per common share (in dollars per share)	$ 0.27	$ 0.25	$ 0.24			$ 0.27	$ 0.28
Cash dividends paid per common share (in dollars per share)	$ 0.27	$ 0.25				$ 0.28
Accrued common stock dividends									$ 29,000,000.0	$ 28,400,000
Common Stock | Subsequent Event
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items]
Cash dividends paid per common share (in dollars per share)					$ 0.28

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