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 |