Investments Low Income Housing Tax Credits (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Low Income Housing Tax Credits [Abstract]
Affordable Housing Tax Credits	$ 5.1	$ 8.3	$ 15.9	$ 24.9
Amortization of Affordable Housing Tax Credit Investments	(4.0)	(5.4)	(11.4)	(16.4)
Tax Benefits from Low Income Housing Investments	$ 1.1	$ 2.9	$ 4.5	$ 8.5