Income Taxes (Income Tax Appellate Tribunal Narrative) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended			12 Months Ended	3 Months Ended					3 Months Ended	12 Months Ended
	Mar. 31, 2012	Jun. 30, 2011	Mar. 31, 2010	Dec. 31, 2010	Mar. 31, 2012 Other Disputes [Member]	Mar. 31, 2012 1995-96 To 2001-02 [Member] Other Disputes [Member]	Dec. 31, 1995 1995-96 To 2001-02 [Member] Other Disputes [Member]	Mar. 31, 2012 2001-02 To 2004-05 [Member]	Dec. 31, 2001 2001-02 To 2004-05 [Member]	Mar. 31, 2012 1996-97 to 2007-08 [Member]	Dec. 31, 2010 Prior Years [Member]
Operating Loss Carryforwards [Line Items]
Unrecognized Indian income tax liabilities							$ 2.09		$ 5.47	$ 4.89
Accrued interest on tax refunds										1.2
Income tax liability recognized						0.04		0.02
Unrecognized Indian income tax liabilities reduced					1.53
Tax adjustments, reduction of tax disputes	2.4
Income tax adjustments provision reversal		$ 0.83	$ 0.33	$ 0.33	$ 0.04						$ 0.40