Income Taxes Income Tax Reconciliation (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 30, 2012
Income Tax Reconciliation [Line Items]
Statutory rate	(35.00%)	(35.00%)	(35.00%)
State tax provisions, net of federal income tax benefit	(0.50%)	(1.00%)	(0.60%)
Permanent differences	(5.30%)	(0.10%)	5.30%
Tax credits	2.80%	6.00%	3.30%
Foreign income taxed at rates other than the statutory rate	(0.50%)	0.70%	0.50%
Valuation allowance and other	(8.40%)	0.00%	(9.80%)
Changes in tax liabilities, net	4.20%	(5.70%)	22.00%
Other	(1.20%)	(2.90%)	3.90%
Effective income tax rate	(43.90%)	(38.00%)	(10.40%)
Effective Income Tax Rate Reconciliation, Other Adjustments, Amount	$ 0.8
Effective Income Tax Rate Reconciliation, Change in Enacted Tax Rate, Amount		1.0
Effective Income Tax Rate Reconciliation, Tax Credit, Research, Amount		1.0
State and Local Jurisdiction [Member]
Income Tax Reconciliation [Line Items]
Income Tax Reconciliation, Change in Deferred Tax Assets Valuation Allowance			3.4
2006 Tax Year, Mexico Operations [Member]
Income Tax Reconciliation [Line Items]
Income Tax Reconciliation, Tax Contingencies, Foreign			(2.1)
MEXICO | 2004 Mexico Tax Audit Settlement [Member]
Income Tax Reconciliation [Line Items]
Income Tax Reconciliation, Tax Settlements, Foreign			0.9
Income Tax Reconciliation, Tax Contingencies, Foreign			(21.7)
MEXICO | Foreign Tax Authority [Member]
Income Tax Reconciliation [Line Items]
Effective Tax Rate Reconciliation, Permanent Difference From Reversal of Reserve, Dollar Value			3.5
UNITED STATES | 2004 Mexico Tax Audit Settlement [Member]
Income Tax Reconciliation [Line Items]
Effective Income Tax Rate Reconciliation, Tax Contingency, Domestic, Amount			12.7