Income Taxes (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 25, 2012	Dec. 30, 2012
Income Taxes [Line Items]
Effective tax rate	(8.00%)	48.30%
Net deferred tax assets	$ 17.4		$ 17.9
Current income tax receivable	2.5		0.5
Estimated tax payments	2.3
Income tax benefit	0.3
Current deferred tax liability	2.3
Unrecognized tax benefit, if recognized, would affect the effective tax rate	16.2		16.3
Interest and penalties expense	0.2	0.2
Accrued interest and penalties related to unrecognized tax benefits	4.5		4.3
Expected change of gross unrecognized tax benefits, minimum	3.6
Expected change of gross unrecognized tax benefits, maximum	$ 5.3
Maximum [Member]
Income Taxes [Line Items]
Income Tax Holiday, Termination Date	2017
Maximum [Member] | Germany [Member]
Income Taxes [Line Items]
Open tax years currently under audit	2009
Maximum [Member] | Finland [Member]
Income Taxes [Line Items]
Open tax years currently under audit	2009
Maximum [Member] | India [Member]
Income Taxes [Line Items]
Open tax years currently under audit	2012
Minimum [Member]
Income Taxes [Line Items]
Income Tax Holiday, Termination Date	2015
Minimum [Member] | Germany [Member]
Income Taxes [Line Items]
Open tax years currently under audit	2006
Minimum [Member] | Finland [Member]
Income Taxes [Line Items]
Open tax years currently under audit	2008
Minimum [Member] | India [Member]
Income Taxes [Line Items]
Open tax years currently under audit	2008