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CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Millions | Jun. 30, 2019 | Dec. 31, 2018
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Statement of Financial Position [Abstract] |  |
Accounts receivable and accrued unbilled revenues, reserves | $ 143.3 | $ 149.2
Property, plant, and equipment, accumulated depreciation | $ 8,705.0 | $ 8,636.6
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 | 315,435,820 | 315,523,192

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