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v3.3.1.900

Acquisitions (Details) $ in Millions |  | 12 Months Ended
--- | --- | ---
Feb. 10, 2016 stores | Dec. 31, 2015 USD ($) stores | Dec. 31, 2014 USD ($) stores | Dec. 31, 2013 USD ($) stores
Subsequent Event [Line Items] |  |  |  |
Number of stores purchased |  | 22 | 5 | 5
Amounts incurred related to acquisitions | $ |  | $ 321.5 | $ 205.2 | $ 87.9
Subsequent Event [Member] |  |  |  |
Subsequent Event [Line Items] |  |  |  |
Number of stores purchased | 12 |  |  |

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