Summary of Significant Accounting Policies (Other Narrative) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Jun. 30, 2017	Dec. 31, 2016	Jun. 30, 2017	Jun. 30, 2016
Accounting Policies [Abstract]
After-tax loss from sale of business	$ 26.8
Impairment charges relating to non-cash write-downs of long-lived assets and working capital	25.4
Transaction related costs from sale of business	$ 1.4
Sale of businesses		$ 4.5	$ 4.5	$ 0.5