v3.4.0.3
Discontinued operations (Details)
$ / shares in Units, $ in Millions
3 Months Ended 6 Months Ended
Jun. 26, 2015
USD ($)
item
MW
Jun. 30, 2015
USD ($)
Mar. 31, 2015
USD ($)
$ / shares
Jun. 30, 2015
USD ($)
Disposal Group, Including Discontinued Operation, Income Statement Disclosures [Abstract]        
Loss from operations of discontinued businesses, net of tax     $ (12.3)  
Loss from operations of discontinued businesses, net of noncontrolling interests     $ (4.8)  
Basic and diluted earnings (loss) per share related to income (loss) from discontinued operations (in dollars per share) | $ / shares     $ (0.03)  
Discontinued Operations, Held-for-sale or Disposed of by Sale        
Disposal Group, Including Discontinued Operation, Income Statement Disclosures [Abstract]        
Revenue     $ 16.7  
Operations and maintenance     5.6  
Depreciation and amortization     10.1  
Total Project expenses     15.7  
Change in fair value of derivatives     (7.3)  
Equity in earnings of unconsolidated affiliates     (0.9)  
Interest expense, net     (3.4)  
Total Project other income (expense)     (11.6)  
Loss from operations of discontinued businesses     (10.6)  
Income tax expense     1.7  
Loss from operations of discontinued businesses, net of tax     (12.3)  
Net loss attributable to noncontrolling interests of discontinued businesses     (7.5)  
Loss from operations of discontinued businesses, net of noncontrolling interests     $ (4.8)  
Basic and diluted earnings (loss) per share related to income (loss) from discontinued operations (in dollars per share) | $ / shares     $ (0.03)  
Wind Projects | Wind (Discontinued Operations) | APT | Discontinued Operations, Held-for-sale or Disposed of by Sale        
Net Cash Provided by (Used in) Discontinued Operations [Abstract]        
Cash provided by operating activities     $ 10.8  
Cash provided by investing activities     1.4  
Wind Projects | Wind (Discontinued Operations) | APT | Discontinued Operations, Disposed of by Sale        
Discontinued operations        
Gain on the disposal   $ 46.8   $ 46.8
Ownership interest sold (as a percent) 100.00%      
Number of operating wind projects sold | item 5      
Wind power project capacity of disposed projects (in MW) | MW 521      
Project debt deconsolidated $ 249.0      
Project debt deconsolidated, including adjustment for entities with proportional ownership interest 274.0      
Non-controlling interests deconsolidated $ 224.0      
Wind Projects | Wind (Discontinued Operations) | APT | Discontinued Operations, Held-for-sale        
Current assets:        
Cash and cash equivalents     6.2  
Accounts receivable     11.2  
Other current assets     2.4  
Total current assets     19.8  
Non-current assets:        
Property, Plant & Equipment     700.5  
Equity investments in unconsolidated affiliates     36.5  
Other intangible assets, net     4.3  
Restricted cash     17.9  
Other assets     1.8  
Assets held for sale     780.8  
Current liabilities:        
Accounts payable and other accrued liabilities     7.7  
Current portion of long-term debt     6.4  
Current portion of derivative instruments liability     4.8  
Total current liabilities     18.9  
Long-term liabilities        
Long-term debt     242.4  
Derivative instruments liability     15.7  
Other long-term liabilities     4.1  
Liabilities held for sale     281.1  
Noncontrolling interests held for sale     $ 228.8  
Goshen North | Wind (Discontinued Operations) | APT | Discontinued Operations, Disposed of by Sale        
Discontinued operations        
Ownership interest sold (as a percent) 12.50%      
Idaho Wind | Wind (Discontinued Operations) | APT | Discontinued Operations, Disposed of by Sale        
Discontinued operations        
Ownership interest sold (as a percent) 27.60%      
Meadow Creek | Wind (Discontinued Operations) | APT | Discontinued Operations, Disposed of by Sale        
Discontinued operations        
Ownership interest sold (as a percent) 100.00%      
Rockland Wind Farm | Wind (Discontinued Operations) | APT | Discontinued Operations, Disposed of by Sale        
Discontinued operations        
Ownership interest sold (as a percent) 50.00%      
Consolidated ownership interest sold (as a percent) 100.00%      
Canadian Hills | Wind (Discontinued Operations) | APT | Discontinued Operations, Disposed of by Sale        
Discontinued operations        
Consolidated ownership interest sold (as a percent) 99.00%