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Legal Proceedings (Details) - Liability for Uncollected Sales Taxes, with Interest and Penalties - Georgia Department of Revenue - USD ($) $ in Millions | May 22, 2017 | Aug. 04, 2015 | Jun. 22, 2015 | Jun. 05, 2015 | Jun. 30, 2011
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Loss Contingencies [Line Items] |  |  |  |  |
Assessed sales tax liability |  | $ 96.1 | $ 100.0 | $ 2.7 | $ 73.8
Subsequent Event [Member] |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |
Assessed sales tax liability | $ 2.6 |  |  |  |

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