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Pension Plans (Details Textual) In Millions, unless otherwise specified	3 Months Ended			12 Months Ended						12 Months Ended											12 Months Ended
	Dec. 31, 2010 USD ($)	Jun. 30, 2010 USD ($)	Mar. 31, 2010 USD ($)	Dec. 31, 2012 USD ($) Entity	Dec. 31, 2011 USD ($)	Dec. 31, 2011 GBP (£)	Dec. 31, 2010 USD ($)	Dec. 31, 2012 United Kingdom Government Gilts [Member]	Dec. 31, 2011 United Kingdom Government Gilts [Member]	Dec. 31, 2012 UK Plan [Member]	Dec. 31, 2011 UK Plan [Member]	Dec. 31, 2010 UK Plan [Member]	Dec. 31, 2012 UK Plan [Member] Equity securities [Member]	Dec. 31, 2011 UK Plan [Member] Equity securities [Member]	Dec. 31, 2010 UK Plan [Member] Equity securities [Member]	Dec. 31, 2012 UK Plan [Member] Debt securities [Member]	Dec. 31, 2011 UK Plan [Member] Debt securities [Member]	Dec. 31, 2010 UK Plan [Member] Debt securities [Member]	Dec. 31, 2012 UK Plan [Member] Index-tracking funds [Member]	Dec. 31, 2011 UK Plan [Member] Index-tracking funds [Member]	Dec. 31, 2012 UK Plan [Member] Cash [Member]	Dec. 31, 2011 UK Plan [Member] Cash [Member]	Dec. 31, 2010 UK Plan [Member] Cash [Member]	Dec. 31, 2012 German Plan [Member] USD ($)
Pension Plans (Additional Textual) [Abstract]
Percentage of asset allocation as per current investment strategy										100.00%	100.00%	100.00%	31.00%	29.00%	27.00%	63.00%	66.00%	73.00%			6.00%	5.00%	0.00%
Percentage of asset allocation, actual								25.00%	25.00%										55.00%	55.00%
Amount of unrecognized actuarial net losses					$ 94.8		$ 164.6																	$ 1.8
Amount of unrecognized actuarial net losses, net of tax					35.1		64.1																	0.8
Pension Plans (Textual) [Abstract]
Retirement age of service				65 years
Number of investment management companies in funds holding				2
Non-cash curtailment loss			8.2
Reduced in Projected Benefit Obligation (PBO)		17.1
Deferred pensioners	15.7
Remaining life expectancy of plan pensioners							15 years
Settlement loss	1.1
Annual cash contribution					9.0	5.8
Annual cash contribution 2013				11
Percentage change in discount rate				0.25%
Amount change in PBO due to discount rate				26
Amount change in net pension charge due to discount rate				0.8
Amount change in PBO due to change price inflation				22.8
Amount change in net pension charge due to change price inflation				2.1
Reduction in actuarial net losses due to change in inflation rate				47
Cash contribution plan period							10 years
Maximum percentage of Plan's assets invested in individual company's investment funds				5.00%
Percentage change in price inflation				0.25%
Accumulated benefit obligation for the Plan				805.3	687.4
Amount of contributions to defined contribution schemes				$ 7.4	$ 6.6

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For defined benefit pension plans, the actuarial present value of benefits (whether vested or nonvested) attributed by the pension benefit formula to employee service rendered before a specified date and based on employee service and compensation (if applicable) before that date. The accumulated benefit obligation differs from the projected benefit obligation in that it includes no assumption about future compensation levels. For plans with flat-benefit or nonpay-related pension benefit formulas, the accumulated benefit obligation and the projected benefit obligation are the same.

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The employer's best estimate, as soon as it can be reasonably determined, of contributions expected to be paid to the plan during the next fiscal year beginning after the date of the latest statement of financial position. Estimated contributions may be presented in the aggregate combining (1) contributions required by funding regulations or laws, (2) discretionary contributions, and (3) noncash contributions.

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Amount of net gain (loss) recognized in net periodic benefit cost as a result of an irrevocable action that relieves the employer (or the plan) of primary responsibility for a benefit obligation and eliminates significant risks related to the obligation and the assets used to effect the settlement. Examples of transactions that constitute a settlement include, but are not limited to, lump-sum cash payments to plan participants in exchange for their rights to receive specified benefits and purchasing nonparticipating annuity contracts to cover vested benefits.

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