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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