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CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Unaudited) - USD ($) $ in Millions | 3 Months Ended
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Mar. 31, 2017 | Mar. 31, 2016
Statement of Comprehensive Income [Abstract] |  |
Net income | $ 356.9 | $ 346.5
Derivatives accounted for as cash flow hedges |  |
Reclassification of gains to net income, net of tax | (0.3) | (0.3)
Defined benefit plans |  |
Amortization of pension and OPEB costs included in net periodic benefit cost, net of tax | 0.1 | 0.0
Other comprehensive loss, net of tax | (0.2) | (0.3)
Comprehensive income | 356.7 | 346.2
Preferred stock dividends of subsidiary | 0.3 | 0.3
Comprehensive income attributed to common shareholders | $ 356.4 | $ 345.9

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