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CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($)
$ in Millions
Mar. 31, 2018
Dec. 31, 2017
Current assets:    
Cash and cash equivalents, consolidated VIEs $ 420.0 $ 481.8
Prepaid expenses and other current assets, VIEs 114.3 33.7
Income tax receivable, VIEs 9.1 9.7
Property, plant and equipment, net of accumulated depreciation, VIEs 2,537.6 2,571.8
Other long-term assets, VIEs 14.0 16.7
Current liabilities:    
Accounts payable, VIEs 343.7 333.9
Personnel accruals, VIEs 27.7 55.9
Accrued taxes other than income taxes, VIEs 23.9 26.5
Other current liabilities, VIEs 86.3 112.4
Long-term liabilities:    
Deferred income taxes, VIEs 386.7 385.9
Other long-term liabilities, VIEs $ 7.9 $ 8.7
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 $ 168.0 $ 223.0
Accounts receivable of VIEs, allowance for doubtful accounts 0.9 1.1
Prepaid expenses and other current assets, VIEs 111.4 30.0
Income tax receivable, VIEs 0.0 0.0
Property, plant and equipment, net of accumulated depreciation, VIEs 2,514.3 2,548.3
Other long-term assets, VIEs 11.0 13.3
Current liabilities:    
Accounts payable, VIEs 340.6 329.0
Personnel accruals, VIEs 17.4 29.9
Accrued taxes other than income taxes, VIEs 23.8 26.5
Other current liabilities, VIEs 85.7 111.8
Long-term liabilities:    
Deferred income taxes, VIEs 0.9 1.0
Other long-term liabilities, VIEs $ 2.9 $ 3.7