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Employee Retirement Plans - Components of Net Periodic Benefit Cost (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Retirement Benefits [Abstract]        
Service cost - benefits earning during the period $ 0.0 $ 0.0 $ 0.0 $ 0.0
Interest cost on projected benefit obligation 1.3 1.4 2.7 2.7
Expected return on assets (1.7) (2.0) (3.4) (3.9)
Actuarial gain 0.0 0.0 0.0 0.0
Foreign currency gain (loss) 0.0 0.0 0.0 0.0
Net periodic benefit $ (0.4) $ (0.6) $ (0.7) $ (1.2)