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CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Millions | Mar. 31, 2020 | Dec. 31, 2019
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Statement of Financial Position [Abstract] |  |
Accounts receivable and unbilled revenues, reserves | $ 164.8 | $ 140.0
Property, plant, and equipment, accumulated depreciation | $ 9,042.3 | $ 8,878.7
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 | 315,434,531 | 315,434,531

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