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Financial Instruments and Fair Value Disclosures (Swaps) (Details)
$ in Millions
1 Months Ended
Jun. 30, 2016
USD ($)
item
Oct. 31, 2015
USD ($)
Sep. 30, 2015
USD ($)
Interest rate swaps | Citibank N.A.      
Derivative Instruments      
Number of interest rate swaps entered into | item 2    
Fixed interest rate (as a percent)   1.38% 1.93%
Nominal value   $ 128.6 $ 200.0
Interest rate swaps | ING Bank N. V. Member      
Derivative Instruments      
Fixed interest rate (as a percent)     2.00%
Nominal value     $ 50.0
Interest rate swaps | CBA      
Derivative Instruments      
Fixed interest rate (as a percent)   1.43%  
Nominal value   $ 85.7  
1.21% interest rate swap due March 2022 | Citibank N.A.      
Derivative Instruments      
Fixed interest rate (as a percent) 1.21%    
Nominal value $ 73.0    
1.16% interest rate swap due March 2022 | Citibank N.A.      
Derivative Instruments      
Fixed interest rate (as a percent) 1.16%    
Nominal value $ 30.0