v2.4.0.6
CONSOLIDATED BALANCE SHEETS (Parenthetical) (USD $)
In Millions, except Share data, unless otherwise specified
Mar. 31, 2013
Dec. 31, 2012
CONSOLIDATED BALANCE SHEETS    
Property, plant, and equipment, accumulated depreciation $ 104.2 $ 79.2
Other intangible assets, accumulated amortization 92.3 76.9
Power purchase and fuel supply agreement liabilities, accumulated amortization $ 5.4 $ 4.4
Common shares, issued shares (in shares) 119,783,366 119,446,865
Common shares, outstanding shares (in shares) 119,783,366 119,446,865