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Acquisition of Shoal Creek Mine Pro Forma Results (Details) - Successor - Shoal Creek - USD ($) $ / shares in Units, $ in Millions | 9 Months Ended | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2018
Business Acquisition, Pro Forma Information, Nonrecurring Adjustment [Line Items] |  |
Revenue | $ 4,506.2 | $ 6,008.4
Income from continuing operations, net of income taxes | $ 783.3 | $ 826.6
Basic earnings per share from continuing operations | $ 4.37 | $ 5.84
Diluted earnings per share from continuing operations | $ 4.33 | $ 5.75

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