Quarterly report pursuant to Section 13 or 15(d)

Multiemployer and Defined Benefit Pension Plans (Details)

v3.8.0.1
Multiemployer and Defined Benefit Pension Plans (Details)
$ in Millions
Sep. 30, 2017
USD ($)
American Maritime Officers Pension Plan [Member]  
Defined Benefit Plan Disclosure [Line Items]  
Pension and other postretirement benefit plans, withdrawal liability $ 34.4