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Atwood Merger (Pro Forma Results) (Details) - Atwood - USD ($) $ / shares in Units, $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2017 | Sep. 30, 2016
Business Acquisition [Line Items] |  |  |  |
Revenues | $ 561.2 | $ 732.2 | $ 1,769.8 | $ 2,960.8
Net income | $ (14.3) | $ 136.0 | $ (24.0) | $ 1,196.9
Earnings per share - basic and diluted | $ (0.03) | $ 0.31 | $ 0 | $ 2.95

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