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Equity and Earnings (Loss) Per Share - Narrative (Details) shares in Millions, $ in Millions |  | 12 Months Ended |  |
--- | --- | --- | --- | ---
Jun. 30, 2016 | Dec. 31, 2015 USD ($) shares | Dec. 31, 2017 USD ($) | Mar. 31, 2014 USD ($)
Earnings Per Share [Abstract] |  |  |  |
Stock split conversion ratio | 0.0667 |  |  |
Shares authorized to be repurchased (in shares) |  |  |  | $ 1,000.0
Shares repurchased (in shares) | shares |  | 2.5 |  |
Aggregate purchase price of shares repurchased |  | $ 604.5 |  |
Dollar value of shares yet to be purchased |  |  | $ 395.9 |

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