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CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2019 | Mar. 31, 2018
Statement of Other Comprehensive Income [Abstract] |  |
Net income | $ 420.4 | $ 390.4
Derivatives accounted for as cash flow hedges |  |
Derivative losses, net of tax | (1.2) | 0.0
Reclassification of net gains to net income, net of tax | (0.3) | (0.2)
Cash flow hedges, net | (1.5) | (0.2)
Defined benefit plans |  |
Amortization of pension and OPEB costs included in net periodic benefit cost, net of tax | 0.1 | 1.9
Other comprehensive (loss) income, net of tax | (1.4) | 1.7
Comprehensive income | 419.0 | 392.1
Preferred stock dividends of subsidiary | 0.3 | 0.3
Comprehensive income attributed to common shareholders | $ 418.7 | $ 391.8

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