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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

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