Investments Low Income Housing Tax Credits (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Low Income Housing Tax Credits [Abstract]
Affordable Housing Tax Credits	$ 8.3	$ 9.4	$ 16.6	$ 18.8
Amortization of Affordable Housing Tax Credit Investments	(5.5)	(6.1)	(11.0)	(12.9)
Tax Benefits from Low Income Housing Investments	$ 2.8	$ 3.3	$ 5.6	$ 5.9