Income Taxes Details Textuals (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		12 Months Ended
	Mar. 31, 2014	Mar. 31, 2013	Mar. 31, 2015
Income Tax Contingency [Line Items]
Income tax benefit (expense)	$ 52.5	$ (3.7)
Remeasurement (benefit) expense related to foreign income tax accounts	(1.4)	1.6
Unrecognized tax benefits, interest and penalties period increase (decrease)	(42.6)
Reasonably possible decrease in net unrecognized tax benefits due to potential audit settlements			25.0
ATO Assessment of Australian Tax Returns [Member]
Income Tax Contingency [Line Items]
Decrease in unrecognized tax benefits	28.9
ATO refund of deposit	6.0
ATO advanced deposit	$ 34.9