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CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($)
$ in Millions
Jun. 30, 2017
Dec. 31, 2016
Current assets:    
Cash and cash equivalents, consolidated VIEs $ 829.9 $ 735.8
Prepaid expenses and other current assets, VIEs 45.8 68.4
Income tax receivable, VIEs 10.1 10.2
Property, plant and equipment, net of accumulated depreciation, VIEs 2,621.2 2,672.1
Other long-term assets, VIEs 20.7 21.4
Current liabilities:    
Accounts payable, VIEs 235.3 251.0
Personnel accruals, VIEs 37.8 45.7
Other current liabilities, VIEs 297.5 217.2
Long-term liabilities:    
Deferred income taxes, VIEs 585.6 579.9
Other long-term liabilities, VIEs $ 34.6 $ 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 $ 567.4 $ 369.7
Accounts receivable of VIEs, allowance for doubtful accounts 1.4 0.5
Prepaid expenses and other current assets, VIEs 42.1 65.0
Income tax receivable, VIEs 0.2 0.2
Property, plant and equipment, net of accumulated depreciation, VIEs 2,595.0 2,645.1
Other long-term assets, VIEs 18.9 19.1
Current liabilities:    
Accounts payable, VIEs 233.2 247.7
Personnel accruals, VIEs 20.8 23.6
Other current liabilities, VIEs 297.2 216.8
Long-term liabilities:    
Deferred income taxes, VIEs 0.8 0.8
Other long-term liabilities, VIEs $ 5.6 $ 5.4