Derivative Financial Instruments (Details) € in Millions, ¥ in Millions, $ in Millions	3 Months Ended	6 Months Ended
	Dec. 31, 2014 USD ($) MBbls	Jun. 30, 2015 EUR (€)	Jun. 30, 2015 JPY (¥)	Jun. 30, 2015 USD ($)	Jun. 30, 2015 JPY (¥)	Jun. 30, 2015 USD ($)
Forward-Start Interest Rate Swap [Member]
Derivative [Line Items]
Notional amount						$ 38.2
Maximum term (in years)		5 years	5 years	5 years
Derivative, underlying basis		one-month London Interbank Offering Rates (“LIBOR”)	one-month London Interbank Offering Rates (“LIBOR”)	one-month London Interbank Offering Rates (“LIBOR”)
Fixed interest rate		5.41%			5.41%	5.41%
Interest Rate Swap, Series B Note [Member]
Derivative [Line Items]
Notional amount						$ 25.0
Derivative, underlying basis		three-month LIBOR	three-month LIBOR	three-month LIBOR
Fixed interest rate		5.51%			5.51%	5.51%
Maturity date of debt		Jul. 28, 2015	Jul. 28, 2015	Jul. 28, 2015
Foreign Currency Hedge - USD Inventory Purchases, Euro Sub [Member]
Derivative [Line Items]
Notional amount		€ 9.7				$ 11.7
Foreign Currency Hedge - Euro Sales, U.S. Sub [Member]
Derivative [Line Items]
Notional amount		9.1				11.0
Foreign Currency Hedge - Yen Inventory Purchases, U.S. [Member]
Derivative [Line Items]
Derivative asset, notional amount					¥ 792.9	6.7
Derivative liability, notional amount					792.9	6.7
Foreign Currency Hedge - Yen Inventory Purchases, Euro Sub [Member]
Derivative [Line Items]
Derivative asset, notional amount					457.7	3.7
Derivative liability, notional amount					¥ 457.7	3.7
Euro-Denominated Revolver [Member]
Derivative [Line Items]
Notional amount, nonderivative instruments		21.0		$ 23.3
Yen-Denominated Revolver [Member]
Derivative [Line Items]
Notional amount, nonderivative instruments			¥ 500.0	4.1
Cumulative foreign currency translation loss (gain)						(1.3)
Cumulative foreign currency translation loss (gain), net of tax						(0.8)
Euro Note B [Member]
Derivative [Line Items]
Notional amount, nonderivative instruments		€ 61.1		$ 67.8
Euro-Denominated Debt [Member]
Derivative [Line Items]
Cumulative foreign currency translation loss (gain)						(16.2)
Cumulative foreign currency translation loss (gain), net of tax						$ (10.3)
Options Held [Member]
Derivative [Line Items]
Derivative, nonmonetary notional amount | MBbls	134,700
Premium paid	$ 0.1