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Consolidated Statements of Comprehensive Income - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Statement of Other Comprehensive Income [Abstract] |  |  |
Net income | $ 1,204.9 | $ 940.2 | $ 640.3
Derivatives accounted for as cash flow hedges |  |  |
Gains on settlement, net of tax of $7.6 | 0.0 | 0.0 | 11.4
Reclassification of gains to net income, net of tax | (1.3) | (1.3) | (0.8)
Cash flow hedges, net | (1.3) | (1.3) | 10.6
Defined benefit plans |  |  |
Pension and OPEB adjustments arising during the period, net of tax of $0.6, $0.1, and $(4.2), respectively | 0.9 | (0.8) | (6.3)
Amortization of pension and OPEB costs included in net periodic benefit cost, net of tax | 0.4 | 0.4 | 0.0
Defined benefit plans, net | 1.3 | (0.4) | (6.3)
Other comprehensive (loss) income, net of tax | 0.0 | (1.7) | 4.3
Comprehensive income | 1,204.9 | 938.5 | 644.6
Preferred stock dividends of subsidiary | 1.2 | 1.2 | 1.8
Comprehensive income attributed to common shareholders | $ 1,203.7 | $ 937.3 | $ 642.8

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