Borrowings (Bank Facilities) (Details) In Millions, unless otherwise specified	0 Months Ended							0 Months Ended		3 Months Ended		0 Months Ended		3 Months Ended		0 Months Ended		3 Months Ended			3 Months Ended						3 Months Ended				3 Months Ended	0 Months Ended	3 Months Ended	0 Months Ended	3 Months Ended				0 Months Ended	3 Months Ended
	Jul. 22, 2008 Alfa Bank [Member]	Mar. 31, 2012 Raiffeisen Bank [Member] USD ($)	Mar. 31, 2012 Raiffeisen Bank [Member] EUR (€)	Mar. 31, 2012 Zenit Bank, Alfa Bank And Raiffeisen Bank [Member] USD ($)	Mar. 31, 2012 Zenit Bank, Alfa Bank And Raiffeisen Bank [Member] EUR (€)	Mar. 31, 2012 Overdraft Facility [Member] Hungary [Member] USD ($)	Mar. 31, 2012 Overdraft Facility [Member] Hungary [Member] HUF	Mar. 29, 2011 Loan Agreement [Member] Zenit Bank [Member] USD ($)	Mar. 29, 2011 Loan Agreement [Member] Zenit Bank [Member] EUR (€)	Mar. 31, 2012 Loan Agreement [Member] Zenit Bank [Member] USD ($)	Mar. 31, 2012 Loan Agreement [Member] Zenit Bank [Member] EUR (€)	Jul. 22, 2008 Loan Agreement [Member] Alfa Bank [Member] USD ($)	Jul. 22, 2008 Loan Agreement [Member] Alfa Bank [Member] EUR (€)	Mar. 31, 2012 Loan Agreement [Member] Alfa Bank [Member] USD ($)	Mar. 31, 2012 Loan Agreement [Member] Alfa Bank [Member] EUR (€)	Jul. 06, 2010 Loan Agreement [Member] Raiffeisen Bank [Member] USD ($)	Jul. 06, 2010 Loan Agreement [Member] Raiffeisen Bank [Member] EUR (€)	Mar. 31, 2012 Loan Agreement [Member] Raiffeisen Bank [Member]	Mar. 31, 2012 Loan Agreement [Member] Unicredit And JSC Grand Invest Bank [Member] USD ($)	Mar. 31, 2012 Loan Agreement [Member] Unicredit And JSC Grand Invest Bank [Member] RUB	Mar. 31, 2012 Loan Agreement [Member] JSC Grand Invest Bank [Member] USD ($)	Mar. 31, 2012 Loan Agreement [Member] JSC Grand Invest Bank [Member] RUB	Mar. 31, 2012 Loan Agreement [Member] Unicredit [Member] USD ($)	Mar. 31, 2012 Loan Agreement [Member] Unicredit [Member] RUB	May 24, 2011 Loan Agreement [Member] Unicredit [Member] USD ($)	May 24, 2011 Loan Agreement [Member] Unicredit [Member] RUB	Mar. 31, 2012 Overdraft Agreement [Member] Sberbank [Member] USD ($)	Mar. 31, 2012 Overdraft Agreement [Member] Sberbank [Member] RUB	Feb. 06, 2012 Overdraft Agreement [Member] Sberbank [Member] USD ($)	Feb. 06, 2012 Overdraft Agreement [Member] Sberbank [Member] RUB	Mar. 31, 2012 Minimum [Member] Raiffeisen Bank [Member]	Mar. 29, 2011 Minimum [Member] Loan Agreement [Member] Zenit Bank [Member]	Mar. 31, 2012 Minimum [Member] Loan Agreement [Member] Zenit Bank [Member]	Jul. 22, 2008 Minimum [Member] Loan Agreement [Member] Alfa Bank [Member]	Mar. 31, 2012 Minimum [Member] Loan Agreement [Member] Alfa Bank [Member]	Mar. 31, 2012 Minimum [Member] Loan Agreement [Member] Raiffeisen Bank [Member]	Mar. 31, 2012 Maximum [Member] Raiffeisen Bank [Member]	Mar. 31, 2012 Maximum [Member] Loan Agreement [Member] Zenit Bank [Member]	Jul. 22, 2008 Maximum [Member] Loan Agreement [Member] Alfa Bank [Member]	Mar. 31, 2012 Maximum [Member] Loan Agreement [Member] Alfa Bank [Member]	Mar. 31, 2012 Maximum [Member] Loan Agreement [Member] Raiffeisen Bank [Member]
Line of Credit Facility [Line Items]
Maximum credit limit under line of credit facility								$ 13.3	€ 10.0			$ 26.7	€ 20.0			$ 13.3	€ 10.0												$ 2.0	60.0
Outstanding liability		6.5	4.9	33.4	25.0					6.7	5.0			20.1	15.1				30.0	879.6	9.5	279.6	20.5	600.0			1.8	52.5
Initiation date										March 29, 2011	March 29, 2011			July 22, 2008	July 22, 2008			July 6, 2010			November 25, 2011	November 25, 2011	May 24, 2011	May 24, 2011			February 6, 2012	February 6, 2012
Maturity date										June 6, 2012	June 6, 2012			October 18, 2014	October 18, 2014			July 6, 2012			November 23, 2012	November 23, 2012	November 23, 2012	November 23, 2012			February 5, 2013	February 5, 2013
Loan agreement, number of tranches								4	4			8	8			5	5
Release of tranches, maturity date	six months																														one	365 days		three months			12		nine months
Date of tranches release, start date										April 21, 2011	April 21, 2011			September 14, 2011	September 14, 2011			September 12, 2011
Date of tranches release, end date										September 13, 2011	September 13, 2011			March 30, 2012	March 30, 2012			October 26, 2011
Repayable date																																	April 20, 2012		April 28, 2012	May 18, 2012		May 18, 2012		October 30, 2012	July 6, 2012
Amount of collateral on term loan																									24.6	720.0
Amount available under open credit facility						$ 0.5	100.0