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CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($)
$ in Millions
Dec. 31, 2017
Dec. 31, 2016
Cash and cash equivalents $ 481.8 $ 735.8
Prepaid expenses and other current assets 33.7 68.4
Income tax receivable 9.7 10.2
Property, plant and equipment, net of accumulated depreciation 2,571.8 2,672.1
Other long-term assets 16.7 15.8
Accounts payable 333.9 251.0
Personnel accruals 55.9 45.7
Other current liabilities 112.4 217.2
Deferred income taxes 385.9 579.9
Other long-term liabilities $ 8.7 $ 32.0
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    
Cash and cash equivalents $ 223.0 $ 369.7
Accounts receivable, allowance for doubtful accounts 1.1 0.5
Prepaid expenses and other current assets 30.0 65.0
Income tax receivable 0.0 0.2
Property, plant and equipment, net of accumulated depreciation 2,548.3 2,645.1
Other long-term assets 13.3 19.1
Accounts payable 329.0 247.7
Personnel accruals 29.9 23.6
Other current liabilities 111.8 216.8
Deferred income taxes 1.0 0.8
Other long-term liabilities $ 3.7 $ 5.4