Valuation and Qualifying Accounts (Details) - USD ($) $ in Millions		12 Months Ended
		Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2013
Reserves Deducted From Assets in the Consolidated Balance Sheet
Valuation and Qualifying Account
Balance at beginning of year		$ 39.1	$ 39.5	$ 36.1
Charged (credited) to costs and expenses		31.6	43.5	30.2
Balance at end of year		29.7	39.1	39.5
Reserves Deducted From Assets in the Consolidated Balance Sheet | Allowance for Doubtful Accounts
Valuation and Qualifying Account
Other	[1]	(39.6)	(43.0)	(27.4)
Reserves Deducted From Assets in the Consolidated Balance Sheet | Allowance for Foreign Currency Exchange Effects
Valuation and Qualifying Account
Other	[2]	(1.4)	(0.9)	0.6
Other Reserves
Valuation and Qualifying Account
Balance at beginning of year		59.2	97.6	77.0
Charged (credited) to costs and expenses		5.1	0.4	(5.7)
Balance at end of year		131.3	59.2	97.6
Other Reserves | Deferred Tax Assets Valuation Allowance
Valuation and Qualifying Account
Other	[3]	66.1	(34.0)	$ 26.3
Other Reserves | Decrease in Unusable Foreign Operating Loss Carryforwards
Valuation and Qualifying Account
Other	[4]	(2.6)	$ (4.8)
Other Reserves | Acquisitions
Valuation and Qualifying Account
Other	[4]	$ 3.5

[1] Uncollectible accounts written off, net of recoveries.

[2] Effects of currency exchange.

[3] Foreign tax credit valuation allowance adjustment.

[4] Decrease in unusable foreign operating loss carryforwards.