Derivative Financial Instruments (Textuals) (Details) € in Millions, ¥ in Millions, $ in Millions	3 Months Ended	12 Months Ended
	Dec. 31, 2015 USD ($)	Dec. 31, 2015 EUR (€) MBbls	Dec. 31, 2015 JPY (¥)	Dec. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)	Dec. 31, 2013 USD ($) agreement	Dec. 31, 2015 USD ($) MBbls
Derivative [Line Items]
Maximum Length of Time Hedged in Cash Flow Hedge						30-60 day
Change in Unrealized Gain (Loss) on Fair Value Hedging Instruments	$ 0.2
Long-term debt					$ 335.5		$ 298.2
Forward Treasury Locks [Member]
Derivative [Line Items]
Debt Instrument, Interest Rate Terms						10-year Treasury rate
Derivative, number of instruments held | agreement						2
Notional amount						$ 160.0
Settlement payment						$ 4.6
Forward-Start Interest Rate Swap [Member]
Derivative [Line Items]
Notional amount							$ 37.1
Debt Instrument, Description of Variable Rate Basis		one-month LIBOR	one-month LIBOR	one-month LIBOR
Maximum term (in years)		5 years	5 years	5 years
Fixed interest rate		5.41%					5.41%
USD inventory purchase hedge [Member]
Derivative [Line Items]
Foreign Currency Cash Flow Hedge Asset at Fair Value		€ 22.1					$ 24.1
Euro USD Fx Contract [Member]
Derivative [Line Items]
Foreign Currency Cash Flow Hedge Asset at Fair Value		18.0					19.7
Euro Note B [Member]
Derivative [Line Items]
Notional amount, nonderivative instruments | €		61.1
Long-term debt							66.8
Euro Note B [Member]
Derivative [Line Items]
Cumulative foreign currency translation gain							9.2
Cumulative foreign currency translation gain, net of tax							5.8
Euro-Denominated Revolver [Member]
Derivative [Line Items]
Notional amount, nonderivative instruments		€ 21.0		$ 22.9
Debt Yen Denominated [Member]
Derivative [Line Items]
Notional amount, nonderivative instruments			¥ 500.0	4.2
Cumulative foreign currency translation gain							$ 0.1
Commodity Call Options [Member]
Derivative [Line Items]
Purchased call options, barrels of crude oil (in barrels) | MBbls		134,700					134,700
Premium paid to purchase call options				0.1
Gain (loss) recorded in cost of goods and services sold, call options				$ (0.1)	$ (0.1)