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CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017
Statement of Other Comprehensive Income [Abstract] |  |  |  |
Net income | $ 231.3 | $ 199.4 | $ 621.7 | $ 556.3
Derivatives accounted for as cash flow hedges |  |  |  |
Reclassification of gains to net income, net of tax | (0.4) | (0.3) | (0.6) | (0.6)
Defined benefit plans |  |  |  |
Amortization of pension and OPEB (credits) costs included in net periodic benefit cost, net of tax | (1.7) | 0.1 | 0.2 | 0.2
Other comprehensive loss, net of tax | (2.1) | (0.2) | (0.4) | (0.4)
Comprehensive income | 229.2 | 199.2 | 621.3 | 555.9
Preferred stock dividends of subsidiary | 0.3 | 0.3 | 0.6 | 0.6
Comprehensive income attributed to common shareholders | $ 228.9 | $ 198.9 | $ 620.7 | $ 555.3

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- Definition Amount of paid and unpaid preferred stock dividends declared with the form of settlement in cash. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 405 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6957935&loc=d3e64057-112817 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 + Details
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