Investments Low Income Housing Tax Credits (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Low Income Housing Tax Credits [Abstract]
Affordable Housing Tax Credits	$ 8.3	$ 9.5	$ 24.9	$ 28.3
Amortization of Affordable Housing Tax Credit Investments	(5.4)	(6.1)	(16.4)	(19.0)
Tax Benefits from Low Income Housing Investments	$ 2.9	$ 3.4	$ 8.5	$ 9.3