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Unaudited Condensed Consolidated Statements of Comprehensive Income - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2019 | Mar. 31, 2018
Statement of Comprehensive Income [Abstract] |  |
Net income | $ 129.9 | $ 207.0
Amortization of prior service credit included in net income | (2.2) | 0.0
Postretirement plans and workers’ compensation obligations | (2.2) | 0.0
Foreign currency translation adjustment | 0.1 | (0.8)
Other comprehensive loss, net of income taxes | (2.1) | (0.8)
Comprehensive income | 127.8 | 206.2
Less: Series A Convertible Preferred Stock dividends | 0.0 | 102.5
Less: Net income (loss) attributable to noncontrolling interests | 5.7 | (2.1)
Comprehensive income attributable to common stockholders | $ 122.1 | $ 105.8

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- Definition Amount after tax of increase (decrease) in equity from transactions and other events and circumstances from net income and other comprehensive income. Excludes changes in equity resulting from investments by owners and distributions to owners. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 45 -Paragraph 19 -URI http://asc.fasb.org/extlink&oid=96868048&loc=SL4569616-111683 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 55 -Paragraph 4K -URI http://asc.fasb.org/extlink&oid=84234705&loc=SL4591552-111686 + Details
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