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Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Millions | Dec. 31, 2017 | Dec. 31, 2016
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Statement of Financial Position [Abstract] |  |
Accounts receivable and unbilled revenues, reserves | $ 143.2 | $ 108.0
Property, plant, and equipment, accumulated depreciation | $ 8,618.5 | $ 8,214.6
Common stock, par value | $ 0.01 |
Common stock, shares authorized | 325,000,000 |
Common stock, shares outstanding | 315,574,624 | 315,614,941

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