Note 16. Commitments and Contingencies Note 16. Commitments and Contingencies (Details) - Contingent Consideration (USD $) In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Business Acquisition, Contingent Consideration [Line Items]
Project Acquisition, Contingent Consideration Liability, Current	$ 31.9	$ 21.3
Project Acquisition, Contingent Consideration Liability, Noncurrent	2.4	47.3
TetraSun and Solar Chile [Member]
Business Acquisition, Contingent Consideration [Line Items]
Business Combination, Contingent Consideration Liability, Current	4.9	16.5
Business Combination, Contingent Consideration Liability, Noncurrent	$ 14.7	$ 11.7