Income Taxes (Details 3) (USD $) In Millions	12 Months Ended
	Sep. 30, 2011
Tax attributes and valuation allowances
Tax credit carryforward, tax benefit amount	$ 74.9
Tax credit carryforward, valuation allowance	30.4
Other tax carryforward, tax benefit amount	2.4
Other tax carryforward, valuation allowance	2.4
Other tax carryforward, carryforward period ends	Indefinite
Total, tax benefit amount	77.3
Total, valuation allowance	32.8
Non-United States - Finite [Member]
Tax attributes and valuation allowances
Net operating loss carryforward, tax benefit amount	7.3
Net operating loss carryforward, valuation allowance	5.0
Net operating loss carryforward, carryforward period ends	2012-2021
Non-United States - Infinite [Member]
Tax attributes and valuation allowances
Net operating loss carryforward, tax benefit amount	12.0
Net operating loss carryforward, valuation allowance	6.2
Net operating loss carryforward, carryforward period ends	Indefinite
Non-United States capital loss carryforward [Member]
Tax attributes and valuation allowances
Other tax carryforward, tax benefit amount	18.3
Other tax carryforward, valuation allowance	18.3
Other tax carryforward, carryforward period ends	Indefinite
United States [Member]
Tax attributes and valuation allowances
Net operating loss carryforward, tax benefit amount	8.5
Net operating loss carryforward, valuation allowance	0
Net operating loss carryforward, carryforward period ends	2019-2027
Tax credit carryforward, tax benefit amount	9.9
Tax credit carryforward, valuation allowance	0
Tax credit carryforward, carryforward period ends	2018-2031
State and Local [Member]
Tax attributes and valuation allowances
Net operating loss carryforward, tax benefit amount	15.4
Net operating loss carryforward, valuation allowance	0.9
Net operating loss carryforward, carryforward period ends	2012-2031
Tax credit carryforward, tax benefit amount	3.5
Tax credit carryforward, valuation allowance	$ 0
Tax credit carryforward, carryforward period ends	2015-2026