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Employee Retirement Benefits - Fair Value of Plan Assets (Details) - Pension Plan - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Total fair value of pension plan assets | $ 140.4 | $ 133.2 | $ 124.3
Plan assets receivable from the Hertz Plan | (3.6) | 3.2 |
Level 1 | Cash |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Total fair value of pension plan assets | 2.2 | 1.5 |
Level 2 |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Total fair value of pension plan assets | 140.4 | 133.2 |
Plan assets receivable from the Hertz Plan | 0.0 | 10.4 |
Level 2 | Total Plan Assets, Excluding Assets Expected to be Transferred in |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Total fair value of pension plan assets | 140.4 | 122.8 |
Level 2 | Short Term Investments |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Total fair value of pension plan assets | 0.1 | 0.2 |
Level 2 | U.S. Large Cap |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Total fair value of pension plan assets | 16.3 | 34.7 |
Level 2 | U.S. Mid Cap |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Total fair value of pension plan assets | 7.3 | 11.3 |
Level 2 | U.S. Small Cap |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Total fair value of pension plan assets | 1.6 | 9.5 |
Level 2 | International Large Cap |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Total fair value of pension plan assets | 17.8 | 20.8 |
Level 2 | International Emerging Markets |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Total fair value of pension plan assets | 6.8 | 6.9 |
Level 2 | U.S. Treasuries |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Total fair value of pension plan assets | 20.8 | 6.8 |
Level 2 | Corporate Bonds |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Total fair value of pension plan assets | 43.7 | 21.4 |
Level 2 | Government Bonds |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Total fair value of pension plan assets | 9.3 | 3.5 |
Level 2 | Municipal Bonds |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Total fair value of pension plan assets | 2.3 | 3.2 |
Level 2 | Mortgage-Backed Securities |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Total fair value of pension plan assets | 2.8 | 1.8 |
Level 2 | Asset-Backed Securities |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Total fair value of pension plan assets | 2.7 | 1.2 |
Level 2 | Bank Loans |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Total fair value of pension plan assets | 6.4 | 0.0 |
Level 2 | Other |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Total fair value of pension plan assets | $ 0.3 | $ 0.0 |

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- Definition Fair value of assets that have been segregated and restricted to provide pension or postretirement benefits. Assets include, but are not limited to, stocks, bonds, other investments, earnings from investments, and contributions by the employer and employees. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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