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Acquisition of Shoal Creek Mine - Pro Forma Financial Information (Details) - Shoal Creek - USD ($) $ / shares in Units, $ in Millions | 3 Months Ended | 6 Months Ended
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Jun. 30, 2018 | Jun. 30, 2018
Business Acquisition, Pro Forma Information, Nonrecurring Adjustment [Line Items] |  |
Revenues | $ 1,390.0 | $ 2,957.7
Income from continuing operations, net of income taxes | $ 150.7 | $ 402.1
Basic earnings per share from continuing operations | $ 1.19 | $ 2.36
Diluted earnings per share from continuing operations | $ 1.17 | $ 2.33

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