Investments Low Income Housing Tax Credits (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Investments, All Other Investments [Abstract]
Low Income Housing Tax Credits	$ 10.4	$ 10.5	$ 31.4	$ 31.4
Amortization of Low Income Housing Investments	(5.9)	(5.8)	(17.5)	(17.4)
Tax Benefits from Low Income Housing Investments	$ 4.5	$ 4.7	$ 13.9	$ 14.0