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Stockholders' Equity - Common Stock (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions |  |  |  | 3 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Sep. 12, 2017 | Mar. 07, 2017 | Nov. 23, 2016 | Dec. 25, 2016 | Dec. 31, 2017 | Dec. 25, 2016 | Dec. 27, 2015 | Nov. 30, 2017 | Sep. 22, 2015 | May 31, 2014
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |
Proceeds from the issuance of common stock |  |  |  |  | $ 269.1 | $ 76.2 | $ 0.0 |  |  |
Net proceeds used to pay-off debt |  |  |  |  | $ 269.1 | 14.1 |  |  |  |
7% Senior Notes due 2019 | Senior notes |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |
Stated interest rate |  |  |  |  | 7.00% |  |  |  |  | 7.00%
Approximate amount of debt paid-off |  |  |  | $ 14.5 | $ 435.5 | $ 14.5 |  |  |  |
Reacquisition price | $ 135.5 |  |  |  |  |  |  | $ 385.2 | $ 175.0 |
Common Stock |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |
Common stock sold (in shares) | 16.1 | 11.9 | 13.4 |  | 28.0 | 13.4 |  |  |  |
Purchase price of common stock sold (dollars per share) | $ 12.25 | $ 7.25 | $ 6.00 |  |  |  |  |  |  |
Gross proceeds from sell of stock |  |  | $ 80.5 |  | $ 283.5 |  |  |  |  |

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