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CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Statement of Other Comprehensive Income [Abstract] |  |  |  |
Net income | $ 233.5 | $ 215.7 | $ 855.2 | $ 772.0
Derivatives accounted for as cash flow hedges |  |  |  |
Net derivative gains, net of tax | 0.3 | 0.0 | 0.3 | 0.0
Reclassification of net gains to net income, net of tax | (0.4) | (0.4) | (1.0) | (1.0)
Cash flow hedges, net | (0.1) | (0.4) | (0.7) | (1.0)
Defined benefit plans |  |  |  |
Amortization of pension and OPEB costs included in net periodic benefit cost, net of tax | 0.0 | 0.3 | 0.2 | 0.5
Other comprehensive loss, net of tax | (0.1) | (0.1) | (0.5) | (0.5)
Comprehensive income | 233.4 | 215.6 | 854.7 | 771.5
Preferred stock dividends of subsidiary | 0.3 | 0.3 | 0.9 | 0.9
Comprehensive income attributed to common shareholders | $ 233.1 | $ 215.3 | $ 853.8 | $ 770.6

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