Annual report pursuant to Section 13 and 15(d)

Leases (Details)

v3.8.0.1
Leases (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Leases [Abstract]      
Operating leases, rent expense $ 18.9 $ 18.8 $ 7.8
Capital leases of lessee, interest rate 2.00%