Quarterly report pursuant to Section 13 or 15(d)

Multiemployer Pension Plans (Details)

v3.2.0.727
Multiemployer Pension Plans (Details)
£ in Millions, $ in Millions
12 Months Ended
Dec. 31, 2011
USD ($)
Jun. 30, 2015
USD ($)
Jun. 30, 2015
GBP (£)
Sep. 30, 2014
USD ($)
American Maritime Officers Pension Plan [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Pension and other postretirement benefit plans, withdrawal liability       $ 39.9
United Kingdom Merchant Navy Ratings Pension Fund [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Pension and Other Postretirement Benefit Expense $ 0.4      
Pension And Other Postretirement Benefit Plans, Total Funding Deficit   $ 510.6 £ 325.0  
Pension and Other Postretirement Benefit Plans, Allocated Share of Funding Deficit   $ 6.6 £ 4.2