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CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Millions | Sep. 30, 2018 | Dec. 31, 2017
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Statement of Financial Position [Abstract] |  |
Accounts receivable and accrued unbilled revenues, reserves | $ 153.7 | $ 143.2
Property, plant, and equipment, accumulated depreciation | $ 8,589.3 | $ 8,618.5
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 | 315,526,051 | 315,574,624

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