Income Taxes (Narrative) (Details) In Millions, except Per Share data, unless otherwise specified	6 Months Ended			3 Months Ended	6 Months Ended
	Mar. 31, 2012 Spanish Tax Settlement [Member] USD ($)	Dec. 31, 2011 Spanish Tax Settlement [Member] USD ($)	Dec. 31, 2011 Spanish Tax Settlement [Member] EUR (€)	Mar. 31, 2012 Spanish Tax Ruling [Member] USD ($)	Mar. 31, 2012 Spanish Tax Ruling [Member]
Income Taxes [Line Items]
Increase (decrease) in income tax expense	$ 43.8			$ (58.3)
Increase (decrease) in income tax expense, per share	$ 0.20			$ (0.27)
Income tax settlement		$ 56.0	€ 41.3
Impact on effective income tax rate due to tax ruling				(19.80%)	(8.90%)
Impact on effective income tax rate due to settlement	6.70%