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CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $)
In Millions, unless otherwise specified
3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Cash flows from operating activities:    
Net income (loss) $ 7.8 $ (39.2)
Adjustments to reconcile to net cash provided by operating activities:    
Depreciation and amortization 49.1 36.5
Reserve related to sale of discontinued operations 27.5  
Long-term incentive plan expense 0.3 1.1
Equity in earnings from unconsolidated affiliates (7.2) (2.9)
Distributions from unconsolidated affiliates 8.9 0.3
Unrealized foreign exchange (gain) loss (5.0) 12.9
Change in fair value of derivative instruments (21.1) 58.1
Change in deferred income taxes (4.1) (17.7)
Change in other operating balances    
Accounts receivable (4.6) 19.5
Inventory 0.9 0.8
Prepayments, refundable income taxes and other assets 39.7 (14.9)
Accounts payable (8.0) 6.6
Accruals and other liabilities (10.0) 5.5
Cash provided by operating activities 74.2 66.6
Cash flows used in investing activities:    
Change in restricted cash (18.7) (6.4)
Biomass development costs   (0.1)
Construction in progress (9.7) (163.5)
Purchase of property, plant and equipment (2.2) (0.7)
Cash used in investing activities (30.6) (170.7)
Cash flows (used in) provided by financing activities:    
Proceeds from project-level debt 20.8 184.2
Repayment of project-level debt (2.6) (2.7)
Offering costs related to tax equity (0.6)  
Payments for revolving credit facility borrowings (2.9) (8.0)
Proceeds from revolving credit facility borrowings   22.8
Equity contribution from noncontrolling interest 2.0  
Deferred financing costs   (10.2)
Dividends paid (36.3) (36.0)
Cash (used in) provided by financing activities (19.6) 150.1
Net increase in cash and cash equivalents 24.0 46.0
Less cash at discontinued operations (5.0)  
Cash and cash equivalents at beginning of period at discontinued operations 6.5  
Cash and cash equivalents at beginning of period 60.2 60.6
Cash and cash equivalents at end of period 85.7 106.6
Supplemental cash flow information    
Interest paid 17.1 18.0
Income taxes paid, net 1.4 0.6
Accruals for construction in progress $ 1.6 $ 3.7