Divestiture Net loss from discontinued operations (Details) - USD ($) $ in Millions	3 Months Ended		12 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Jun. 30, 2015
Discontinued Operations and Disposal Groups [Abstract]
Revenues	$ 0.0	$ 516.6
Earnings from discontinued operations before income taxes	0.0	67.7
Provision for income taxes	0.0	69.1
Net loss from discontinued operations before gain on disposal of discontinued operations	0.0	(1.4)
Adjustment of gain on disposal of P2P	(1.4)	0.0	$ 100.9
Provision for income taxes	0.5	0.0
Net adjustment of gain on disposal of P2P	(0.9)	0.0
Net loss from discontinued operations	$ (0.9)	$ (1.4)