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Derivative Financial Instruments (Textuals) (Details)
€ in Millions, ¥ in Millions, DKK in Millions, $ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2017
USD ($)
Sep. 30, 2017
EUR (€)
MBbls
Sep. 30, 2017
JPY (¥)
Sep. 30, 2017
USD ($)
Sep. 30, 2017
USD ($)
MBbls
Sep. 30, 2017
DKK
MBbls
Dec. 31, 2016
EUR (€)
MBbls
Forward Start Interest Rate Swap [Member]              
Derivative [Line Items]              
Notional amount         $ 33.1    
Maximum term (in years)   5 years 5 years 5 years      
Derivative, underlying basis   one-month London Interbank Offered Rate (“LIBOR”) one-month London Interbank Offered Rate (“LIBOR”) one-month London Interbank Offered Rate (“LIBOR”)      
Fixed interest rate   5.41%     5.41% 5.41%  
Debt EUR Denominated [Member]              
Derivative [Line Items]              
Notional amount, nonderivative instruments   € 21.0   $ 24.8      
Cumulative foreign currency translation gain         $ 1.0    
Cumulative foreign currency translation gain, net of tax         0.6    
Debt Yen Denominated [Member]              
Derivative [Line Items]              
Notional amount, nonderivative instruments     ¥ 500.0 4.5      
Cumulative foreign currency translation gain         0.3    
Cumulative foreign currency translation gain, net of tax         $ 0.2    
Options Held [Member]              
Derivative [Line Items]              
Derivative, nonmonetary notional amount | MBbls   17,550     17,550 17,550 96,525
Premium paid       0.2      
Loss related to call options $ 0.1     $ 0.2      
Euro Member Countries, Euro | Forward Contracts [Member]              
Derivative [Line Items]              
Notional amount | €   € 72.5         € 57.5
Denmark, Kroner | Forward Contracts [Member]              
Derivative [Line Items]              
Notional amount | DKK           DKK 83.4  
Long [Member] | Designated as Hedging Instrument [Member] | Singapore, Dollars | Foreign Exchange Forward [Member]              
Derivative [Line Items]              
Notional amount         $ 29.9    
Long [Member] | Designated as Hedging Instrument [Member] | United States of America, Dollars | Foreign Exchange Forward [Member]              
Derivative [Line Items]              
Notional amount         46.3    
Long [Member] | Designated as Hedging Instrument [Member] | Japan, Yen | Foreign Exchange Forward [Member]              
Derivative [Line Items]              
Notional amount         5,255.3    
Short [Member] | Designated as Hedging Instrument [Member] | Singapore, Dollars | Foreign Exchange Forward [Member]              
Derivative [Line Items]              
Notional amount   6.2     14.6    
Short [Member] | Designated as Hedging Instrument [Member] | United States of America, Dollars | Foreign Exchange Forward [Member]              
Derivative [Line Items]              
Notional amount   41.8     0.0    
Short [Member] | Designated as Hedging Instrument [Member] | Japan, Yen | Foreign Exchange Forward [Member]              
Derivative [Line Items]              
Notional amount   € 16.6     $ 28.3