CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017
Cash provided by operating activities:
Net income (loss)	$ 15.1	$ (20.3)
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Depreciation and amortization	44.7	59.0
Share-based compensation	1.1	1.1
Equity in (earnings) loss from unconsolidated affiliates	(23.5)	45.4
Distributions from unconsolidated affiliates	27.3	17.2
Unrealized foreign exchange (gain) loss	(13.3)	8.3
Change in fair value of derivative instruments	(3.6)	3.9
Change in fair value of convertible debenture conversion option derivative	(2.3)
Amortization of debt discount and deferred financing costs	5.4	5.2
Change in deferred income taxes	2.0	(24.9)
Change in other operating balances
Accounts receivable	27.4	(5.0)
Inventory	3.7	(3.4)
Prepayments and other assets	3.8	(0.3)
Accounts payable	(1.9)	(1.4)
Accruals and other liabilities	(7.5)	0.9
Cash provided by operating activities	78.4	85.7
Cash used in investing activities:
Investment in equity method project	(1.1)
Purchase of property, plant and equipment	(1.3)	(4.2)
Cash used in investing activities	(2.4)	(4.2)
Cash used in financing activities:
Proceeds from convertible debenture issuance	92.2
Repayment of convertible debentures	(88.0)
Common share repurchases	(9.2)
Preferred share repurchases	(4.5)
Repayment of corporate and project-level debt	(58.8)	(56.9)
Cash payments for vested LTIP units withheld for taxes	(0.8)	(0.7)
Deferred financing costs	(4.8)
Dividends paid to preferred shareholders	(4.3)	(4.3)
Cash used in financing activities:	(78.2)	(61.9)
Net (decrease) increase in cash, restricted cash and cash equivalents	(2.2)	19.6
Cash, restricted cash and cash equivalents at beginning of period	84.9	98.8
Cash, restricted cash and cash equivalents at end of period	82.7	118.4
Supplemental cash flow information
Interest paid	20.2	33.4
Income taxes paid, net	1.9	2.2
Accruals for construction in progress	$ 0.1	$ 1.3