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Restructuring and Asset Impairments - Narrative (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring expense | $ 27.2 | $ 23.4 | $ 9.4
Asset impairment expense | 0.1 | 96.9 | $ 15.3
Fixed Assets |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Asset impairment expense |  | 13.8 |
Enterprise Resource Planning Platform |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Asset impairment expense |  | 58.6 |
SAP and Other Information Technology Assets |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Asset impairment expense |  | 18.6 |
Employee Severance |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring expense |  | $ 2.3 |
Employee Severance | Chief Financial Officer |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring expense | $ 2.8 |  |

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