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CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($)
$ in Millions
Jun. 30, 2016
Dec. 31, 2015
Current assets:    
Cash and cash equivalents, consolidated VIEs $ 690.6 $ 765.1
Accounts receivable of VIEs, allowance for doubtful accounts 0.6 0.3
Prepaid expenses and other current assets, VIEs 88.1 104.3
Income tax receivable, VIEs 7.0 6.9
Property, plant and equipment, net of accumulated depreciation, VIEs 2,723.5 1,967.1
Other long-term assets, VIEs 16.4 17.5
Current liabilities:    
Accounts payable, VIEs 241.9 261.5
Personnel accruals, VIEs 34.8 45.7
Other current liabilities, VIEs 70.3 24.4
Long-term liabilities:    
Deferred income taxes, VIEs 668.9 639.7
Other long-term liabilities, VIEs $ 31.6 $ 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    
Current assets:    
Cash and cash equivalents, consolidated VIEs $ 235.6 $ 237.3
Prepaid expenses and other current assets, VIEs 79.7 101.2
Income tax receivable, VIEs 0.2 0.0
Property, plant and equipment, net of accumulated depreciation, VIEs 2,698.6 1,942.6
Other long-term assets, VIEs 13.1 13.0
Current liabilities:    
Accounts payable, VIEs 240.1 258.0
Personnel accruals, VIEs 18.3 21.7
Other current liabilities, VIEs 69.9 23.9
Long-term liabilities:    
Deferred income taxes, VIEs 0.5 0.1
Other long-term liabilities, VIEs $ 6.4 $ 3.1