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CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $)
In Millions, unless otherwise specified
 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Cash flows from operating activities:    
Net loss $ (31.7) $ (45.8)
Adjustments to reconcile to net cash provided by operating activities:    
Depreciation and amortization 135.0 117.5
Loss of discontinued operations 32.8  
(Gain) loss on sale of assets & other charges (4.6) 0.8
Long-term incentive plan expense 1.7 2.3
Impairment charges 39.8 3.0
Gain on sale of equity investments (30.4) (0.6)
Equity in earnings from unconsolidated affiliates (24.6) (14.8)
Distributions from unconsolidated affiliates 28.5 26.8
Unrealized foreign exchange loss 1.5 21.7
Change in fair value of derivative instruments (44.1) 41.0
Change in deferred income taxes (11.9) (24.4)
Change in other operating balances    
Accounts receivable 4.5 (2.9)
Inventory (1.5) (5.5)
Prepayments, refundable income taxes and other assets 54.2 (13.2)
Accounts payable (11.9) 14.9
Accruals and other liabilities 6.0 3.3
Cash provided by operating activities 143.3 124.1
Cash flows provided by (used in) investing activities:    
Change in restricted cash (99.1) (105.5)
Proceeds from sale of assets and equity investments, net 183.0 27.9
Cash paid for equity investment   (0.3)
Proceeds from treasury grant 103.2  
Biomass development costs (0.1) (0.4)
Construction in progress (32.2) (336.0)
Purchase of property, plant and equipment (7.2) (1.2)
Cash provided by (used in) investing activities 147.6 (415.5)
Cash flows (used in) provided by financing activities:    
Proceeds from issuance of convertible debentures   130.0
Proceeds from issuance of equity, net of offering costs   67.7
Proceeds from project-level debt 20.8 261.3
Repayment of project-level debt (115.4) (12.1)
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 (0.5) (25.3)
Dividends paid to common shareholders (54.2) (108.2)
Dividends paid to noncontrolling interests (13.9)  
Cash (used in) provided by financing activities (186.6) 275.4
Net increase (decrease) in cash and cash equivalents 104.3 (16.0)
Less cash at discontinued operations (0.3) (1.8)
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 170.7 42.9
Supplemental cash flow information    
Interest paid 87.0 77.7
Income taxes paid, net 4.6 3.1
Accruals for construction in progress $ 8.3 $ 40.1