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Employee Benefit Plans - Narratives (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Defined Benefit Plan Disclosure      
Accrued pension liability $ 9.4 $ 10.8  
Estimated net periodic pension expense to be amortized over the next fiscal year (0.3)    
Projected benefit obligation 58.5 53.6 $ 57.0
Fair value of plan assets 49.1 42.8 48.5
Multiemployer plan, contributions by employer 0.5 0.4 0.3
Defined contribution expense 9.2 8.7 8.2
Compensation expense 0.3 0.4 $ 0.5
Hudson      
Defined Benefit Plan Disclosure      
Accrued pension liability 0.8 0.8  
Hudson      
Defined Benefit Plan Disclosure      
Projected benefit obligation 2.9 2.5  
Fair value of plan assets $ 2.0 $ 1.7