Supplemental Information (Other Noncurrent Assets) (Details) - USD ($) $ in Millions	Sep. 30, 2015	Sep. 30, 2014
Supplemental Information [Abstract]
Derivative instruments	$ 246.0	$ 65.1
Other long-term receivables	21.4	35.1
Deferred financing cost, net	21.5	25.5
Prepaid tax	31.3	31.3
Deferred tax assets	69.0	56.6
Pension benefits	4.3	22.9
Deposits	40.1	51.0
Other	201.3	138.8
Other noncurrent assets total	$ 634.9	$ 426.3