Noncontrolling Interests (Rollforward Redeemable Noncontrolling Interest) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Mar. 31, 2014	Mar. 31, 2013	Mar. 31, 2014	Mar. 31, 2013
Redeemable Noncontrolling Interest [Line Items]
Balance, beginning of period	$ 358.7	$ 390.7	$ 375.8	$ 392.5
Net income (loss)	0.7	2.1	2.0	4.2
Dividends	0	0	(3.5)	0
Currency translation adjustment	(15.8)	5.9	(30.7)	2.0
Balance, end of period	$ 343.6	$ 398.7	$ 343.6	$ 398.7