Acquisitions (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended
	Dec. 31, 2015	Jun. 30, 2015
Business Combinations [Abstract]
Business Acquisition, Name of Acquired Entity	PGGM Levensverzekeringen, N.V.	Aurora National
Business Acquisition, Percentage of Voting Interests Acquired		100.00%
Payments to Acquire Businesses, Gross		$ 191.5
Noncash or Part Noncash Acquisition, Value of Assets Acquired	$ 404.4	3,700.0
Noncash or Part Noncash Acquisition, Investments Acquired	395.6	3,600.0
Noncash or Part Noncash Acquisition, Value of Liabilities Assumed	$ 394.1	$ 3,500.0