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CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($)
$ in Millions
Mar. 31, 2016
Dec. 31, 2015
Current assets:    
Cash and cash equivalents, consolidated VIEs $ 681.8 $ 765.1
Accounts receivable of VIEs, allowance for doubtful accounts 0.5 0.3
Prepaid expenses and other current assets, VIEs 84.3 104.3
Property, plant and equipment, net of accumulated depreciation, VIEs 1,972.4 1,967.1
Other long-term assets, VIEs 16.2 17.5
Current liabilities:    
Accounts payable, VIEs 249.6 261.5
Personnel accruals, VIEs 23.7 45.7
Other current liabilities, VIEs 47.1 24.4
Long-term liabilities:    
Deferred income taxes, VIEs 624.3 639.7
Other long-term liabilities, VIEs $ 27.6 $ 33.9
Equity:    
Common stock, par value (in dollars per share) $ 0.01 $ 0.01
Common stock authorized (in shares) 350,000,000 350,000,000
Common stock issued (in shares) 86,929,660 86,929,660
Treasury stock (in shares) 98,610 98,610
Variable Interest Entities, Primary Beneficiary    
Current assets:    
Cash and cash equivalents, consolidated VIEs $ 197.9 $ 237.3
Prepaid expenses and other current assets, VIEs 76.2 101.2
Property, plant and equipment, net of accumulated depreciation, VIEs 1,947.4 1,942.6
Other long-term assets, VIEs 12.4 13.0
Current liabilities:    
Accounts payable, VIEs 246.1 258.0
Personnel accruals, VIEs 11.9 21.7
Other current liabilities, VIEs 46.7 23.9
Long-term liabilities:    
Deferred income taxes, VIEs 0.1 0.1
Other long-term liabilities, VIEs $ 3.1 $ 3.1