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Divestitures - (Details) $ in Millions |  | 12 Months Ended
--- | --- | ---
Oct. 30, 2015 USD ($) branch | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($)
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |
Gain on disposal of business |  | $ 0.0 |  | $ (50.9)
France and Spain Operations | Disposal Group, Disposed of by Sale, Not Discontinued Operations |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |
Gain on disposal of business |  |  | $ 0.0 | $ 50.9
Release of currency translation adjustments from accumulated other comprehensive loss | $ 41.6 |  |  |
France Operation | Disposal Group, Disposed of by Sale, Not Discontinued Operations |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |
Number of locations sold | branch | 60 |  |  |
Spain Operation | Disposal Group, Disposed of by Sale, Not Discontinued Operations |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |
Number of locations sold | branch | 2 |  |  |

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