Shareholders' Equity - Narrative (Details) - USD ($) $ / shares in Units, $ in Millions				3 Months Ended
	Jan. 27, 2020	Nov. 11, 2019	Apr. 29, 2019	Dec. 31, 2019	Dec. 31, 2018	Jul. 31, 2015
Class of Stock [Line Items]
Dividends to common shareholders				$ 21.4	$ 18.4
Dividend declared (in dollars per share)		$ 0.30			$ 0.30
Dividends paid				22.7	$ 19.8
Preferred stock dividend declared (in dollars per share)			$ 1.875
Payments of Ordinary Dividends, Preferred Stock and Preference Stock				4.0	0.0
Subsequent Event
Class of Stock [Line Items]
Dividend declared (in dollars per share)	$ 0.30
Preferred stock dividend declared (in dollars per share)	$ 1.875
Common Stock
Class of Stock [Line Items]
Number of shares authorized to be acquired (shares)						7,500,000
Retained Earnings
Class of Stock [Line Items]
Dividends to common shareholders				$ 21.4	$ 18.4