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CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Millions | Sep. 30, 2017 | Dec. 31, 2016
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Statement of Financial Position [Abstract] |  |
Accounts receivable and accrued unbilled revenues, reserves | $ 112.7 | $ 108.0
Property, plant, and equipment, accumulated depreciation | $ 8,525.5 | $ 8,214.6
Common stock, par value (in dollars per share) | $ 0.01 | $ 0.01
Common stock, shares authorized | 325,000,000 | 325,000,000
Common stock, shares outstanding | 315,575,562 | 315,614,941

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