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CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $)
In Millions, unless otherwise specified
 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Cash flows from operating activities:    
Net income (loss) $ 9.0 $ (41.3)
Adjustments to reconcile to net cash provided by operating activities:    
Depreciation and amortization 92.8 76.8
Loss of discontionued operations 32.8  
Gain on sale of assets & other charges (4.4)  
Long-term incentive plan expense 1.2 1.5
Impairment charges 4.9 3.0
Gain on sale of equity investments   (0.6)
Equity in earnings from unconsolidated affiliates (15.9) (10.8)
Distributions from unconsolidated affiliates 18.0 8.7
Unrealized foreign exchange (gain) loss (8.7) 11.8
Change in fair value of derivative instruments (47.7) 58.2
Change in deferred income taxes (6.5) (26.0)
Change in other operating balances    
Accounts receivable (3.6) 20.3
Inventory (1.3) (4.3)
Prepayments, refundable income taxes and other assets 46.3 (9.8)
Accounts payable (9.4) (0.4)
Accruals and other liabilities (10.6) 2.2
Cash provided by operating activities 96.9 89.3
Cash flows provided by (used in) investing activities:    
Change in restricted cash (19.4) 2.3
Proceeds from sale of assets, net 148.3  
Proceeds from sale of equity investments   24.2
Cash paid for equity investment   (0.3)
Proceeds from treasury grant 53.7  
Biomass development costs (0.1) (0.2)
Construction in progress (26.2) (230.2)
Purchase of property, plant and equipment (5.0) (0.8)
Cash provided by (used in) investing activities 151.3 (205.0)
Cash flows (used in) provided by financing activities:    
Proceeds from project-level debt 20.8 255.3
Repayment of project-level debt (64.2) (9.3)
Offering costs related to tax equity (1.0)  
Payments for revolving credit facility borrowings (67.0) (60.8)
Proceeds from revolving credit facility borrowings   22.8
Equity contribution from noncontrolling interest 44.6  
Deferred financing costs   (18.9)
Dividends paid (52.5) (71.4)
Cash (used in) provided by financing activities (119.3) 117.7
Net increase in cash and cash equivalents 128.9 2.0
Cash and cash equivalents at beginning of period at discontinued operations 6.5  
Cash and cash equivalents at beginning of period 60.2 60.7
Cash and cash equivalents at end of period 195.6 62.7
Supplemental cash flow information    
Interest paid 65.3 58.2
Income taxes paid, net 1.4 1.5
Accruals for construction in progress $ 8.6 $ 25.5