XML 112 R99.htm IDEA: XBRL DOCUMENT v3.8.0.1
Employee Benefit Plans - Components of the Net Periodic Pension Cost (Details)
$ in Millions
3 Months Ended
Mar. 31, 2018
USD ($)
Pension Plan  
Defined Benefit Plan Disclosure [Line Items]  
Interest cost $ 0.3
Expected return on plan assets, net of expenses (0.4)
Net periodic pension cost (0.1)
SERP  
Defined Benefit Plan Disclosure [Line Items]  
Interest cost 0.1
Expected return on plan assets, net of expenses 0.0
Net periodic pension cost $ 0.1