Annual report pursuant to Section 13 and 15(d)

Leases - Additional Information (Details)

v3.10.0.1
Leases - Additional Information (Details)
$ in Millions
12 Months Ended
Dec. 31, 2018
USD ($)
RealEstate
Location
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Leases Operating [Abstract]      
Number of real estate leases | RealEstate 32    
Number of service center locations | Location 235    
Aggregate expense under operating leases | $ $ 12.6 $ 14.1 $ 13.8