Investments Low Income Housing Tax Credits (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Low Income Housing Tax Credits [Abstract]
Affordable Housing Tax Credits	$ 5.4	$ 8.3	$ 10.8	$ 16.6
Amortization of Affordable Housing Tax Credit Investments	(3.7)	(5.5)	(7.4)	(11.0)
Tax Benefits from Low Income Housing Investments	$ 1.7	$ 2.8	$ 3.4	$ 5.6