Note 16 - Capital Stock Capital Stock (Details) - USD ($) shares in Millions, $ in Millions	3 Months Ended
	Jun. 30, 2015	Jun. 18, 2015
Class of Stock [Line Items]
Stock Repurchase Program, Authorized Amount		$ 202.0
Stock Repurchased During Period, Shares	9.2
Convertible Senior Notes Due 2017
Class of Stock [Line Items]
Extinguishment of Debt, Amount	$ 389.1
Payments of Debt Extinguishment Costs	$ 126.8
Debt Conversion, Converted Instrument, Shares Issued	28.4
Convertible Debt, Termination of Capped Call Transaction, Total Consideration	$ 54.9
Convertible Debt, Termination of Capped Call Transaction, Number of Shares Received	2.3
Convertible Debt, Termination of Capped Call Transaction, Total Cash Received	$ 12.0