Fair Values of Financial and Nonfinancial Instruments 2 (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Fair Value Disclosures [Abstract]
Realized Gain (Loss) on Mortgage Interest Rate Lock Commitments	$ 1.3	$ 2.3	$ 3.8	$ 3.2
Hedging Instruments Gain (Loss) Recognized in Income	2.7	(4.2)	1.4	(7.2)
Gain (Loss) on Sale of Mortgage Loans	$ 5.7	$ 7.4	$ 11.2	$ 12.8