Fair Value Measurements And Derivative Instruments (Narrative) (Details) - USD ($)	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Derivatives, Fair Value [Line Items]
Fair value of long-term debt		$ 273,400,000
Other Long-term Debt, Current	$ 367,200,000	529,700,000
Unrealized loss on foreign currency derivatives		900,000
Unrealized gain (loss)	0
Commodity derivative contracts, unrealized gain	0	7,100,000
Hedging Instruments, Non-derivative, Assets	11,800,000	15,800,000
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Gain (Loss) Arising During Period, Net of Tax	1,400,000	200,000
Foreign Currency Derivatives [Member]
Derivatives, Fair Value [Line Items]
Notional amounts of foreign currency derivatives	$ 95,200,000	18,700,000
Commodity Derivative Contracts [Member] | Refined Oil Products [Member]
Derivatives, Fair Value [Line Items]
Outstanding derivative swap contracts		$ 17,800,000
Minimum [Member] | Foreign Currency Derivatives [Member]
Derivatives, Fair Value [Line Items]
Derivative maturities	January 2016
Maximum [Member] | Foreign Currency Derivatives [Member]
Derivatives, Fair Value [Line Items]
Derivative maturities	March 2016
Level 2 [Member]
Derivatives, Fair Value [Line Items]
Fair value of long-term debt	$ 473,300,000