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CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018
Statement of Other Comprehensive Income [Abstract] |  |  |  |
Net income | $ 234.3 | $ 233.5 | $ 890.5 | $ 855.2
Derivatives accounted for as cash flow hedges |  |  |  |
Derivative (losses) gains, net of tax of $(0.2), $0.1, $(1.5), and $0.1, respectively | (0.3) | 0.3 | (3.8) | 0.3
Reclassification of net gains to net income, net of tax | (0.2) | (0.4) | (0.8) | (1.0)
Cash flow hedges, net | (0.5) | (0.1) | (4.6) | (0.7)
Defined benefit plans |  |  |  |
Amortization of pension and OPEB costs included in net periodic benefit cost, net of tax | 0.0 | 0.0 | 0.1 | 0.2
Other comprehensive loss, net of tax | (0.5) | (0.1) | (4.5) | (0.5)
Comprehensive income | 233.8 | 233.4 | 886.0 | 854.7
Preferred stock dividends of subsidiary | 0.3 | 0.3 | 0.9 | 0.9
Comprehensive loss attributed to noncontrolling interests | 0.3 | 0.0 | 0.5 | 0.0
Comprehensive income attributed to common shareholders | $ 233.8 | $ 233.1 | $ 885.6 | $ 853.8

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