Investments Low Income Housing Tax Credits (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Low Income Housing Tax Credits [Abstract]
Affordable Housing Tax Credits	$ 33.2	$ 37.8	$ 41.4
Amortization of Affordable Housing Tax Credit Investments	(21.9)	(25.2)	(28.1)
Tax Benefits from Low Income Housing Investments	$ 11.3	$ 12.6	$ 13.3