Income Taxes Income Taxes Prior Period Adjustment (Details) (USD $) In Millions, unless otherwise specified	0 Months Ended	3 Months Ended								12 Months Ended
	Apr. 02, 2012	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2012
Deferred Tax Assets, Valuation Allowance		$ 31.1				$ 31.0		$ 23.2		$ 31.1	$ 31.0
Increase (Decrease) in Deferred Income Taxes										(17.4)	(130.9)	709.5
Valuation Allowance, Deferred Tax Asset, Change in Amount	753.2					(2.9)		18.7
Income Tax Expense (Benefit)		84.5	58.7	70.9	66.5	63.3	59.1	31.1	41.6	280.7	195.1	(713.4)
Scenario, ProForma [Member]
Deferred Tax Assets, Valuation Allowance						7.1					7.1
Increase (Decrease) in Deferred Income Taxes												31.6
Valuation Allowance, Deferred Tax Asset, Change in Amount												37.6
Income Tax Expense (Benefit)											$ 6.0	$ 6.0