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CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($)
$ in Millions
Sep. 30, 2017
Dec. 31, 2016
Current assets:    
Cash and cash equivalents, consolidated VIEs $ 849.1 $ 735.8
Prepaid expenses and other current assets, VIEs 41.1 68.4
Income tax receivable, VIEs 10.2 10.2
Property, plant and equipment, net of accumulated depreciation, VIEs 2,586.5 2,672.1
Other long-term assets, VIEs 21.9 21.4
Current liabilities:    
Accounts payable, VIEs 281.9 251.0
Personnel accruals, VIEs 48.5 45.7
Accrued taxes other than income taxes, VIEs 23.3 27.0
Other current liabilities, VIEs 240.5 217.2
Long-term liabilities:    
Deferred income taxes, VIEs 593.2 579.9
Other long-term liabilities, VIEs $ 35.2 $ 32.0
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 $ 630.3 $ 369.7
Accounts receivable of VIEs, allowance for doubtful accounts 1.3 0.5
Prepaid expenses and other current assets, VIEs 38.2 65.0
Income tax receivable, VIEs 0.2 0.2
Property, plant and equipment, net of accumulated depreciation, VIEs 2,562.2 2,645.1
Other long-term assets, VIEs 18.4 19.1
Current liabilities:    
Accounts payable, VIEs 279.5 247.7
Personnel accruals, VIEs 24.6 23.6
Accrued taxes other than income taxes, VIEs 23.1 27.0
Other current liabilities, VIEs 240.0 216.8
Long-term liabilities:    
Deferred income taxes, VIEs 0.7 0.8
Other long-term liabilities, VIEs $ 5.6 $ 5.4