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Earnings Per Common Share - Textual (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions																	1 Months Ended	12 Months Ended
	Jan. 15, 2019	Oct. 26, 2018	Oct. 15, 2018	Jul. 24, 2018	Jul. 16, 2018	Apr. 16, 2018	Feb. 23, 2018	Jan. 16, 2018	Oct. 20, 2017	Oct. 16, 2017	Jul. 20, 2017	Oct. 17, 2016	Jul. 21, 2016	Oct. 15, 2015	Jul. 16, 2015	Sep. 30, 2009	Jan. 17, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Jul. 25, 2018	Feb. 14, 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)																			0.2
Common stock repurchased																			$ 38.1	$ 65.6
Cash dividends declared per common share (in dollars per share)																		$ 1.04	$ 0.98	$ 0.94
Common stock, par value (in dollars per share)																		$ 0.01	$ 0.01
Common stock issued and delivered (shares)																			8.9
Common stock issued (shares)																5.0	0.7
Common stock warrants issued																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																	$ 26.7	$ 0.0	$ 26.6	$ 0.0
Common Stock [Member]
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items]
Common stock repurchase authorization																					$ 250.0	$ 250.0	$ 200.0
Common stock repurchased (shares)																		0.0	0.9	1.7
Common stock repurchased																			$ 38.1	$ 65.6
Cash dividends declared per common share (in dollars per share)		$ 0.27		$ 0.27			$ 0.25		$ 0.25		$ 0.25		$ 0.24		$ 0.23
Cash dividends paid per common share (dollars per share)			$ 0.27		$ 0.25	$ 0.25		$ 0.25		$ 0.25		$ 0.24		$ 0.23
Accrued common stock dividends																		$ 28.4	$ 25.4
Common Stock [Member] | Subsequent Event [Member]
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items]
Cash dividends paid per common share (dollars per share)	$ 0.27

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