Supplemental Guarantor Condensed Financial Information (Condensed Statements Of Operations and Comprehensive Income (Loss)) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 30, 2018	Mar. 31, 2017
Net sales:
Customers	$ 1,020.5	$ 918.2
Intercompany	0.0	0.0
Net sales	1,020.5	918.2
Cost of sales	914.8	799.2
Gross profit	105.7	119.0
Selling, general and administrative expenses	71.4	94.8
Operating income	34.3	24.2
Other income (expense)	(15.6)	14.6
Interest income (expense):
Interest expense	(19.2)	(20.7)
Interest income	0.9	0.6
Interest income (expense), total	(18.3)	(20.1)
Income (loss) before income taxes	0.4	18.7
Income tax (provision) benefit	(4.6)	(6.3)
Equity in net earnings of affiliated companies and subsidiaries	0.0	0.0
Net income (loss) including noncontrolling interest	(4.2)	12.4
Less: net income (loss) attributable to noncontrolling interest	0.1	0.0
Net income (loss) attributable to Company common shareholders	(4.3)	12.4
Comprehensive income (loss):
Net income (loss)	(4.2)	12.4
Currency translation gain (loss)	2.9	8.6
Defined benefit plan adjustments, net of tax	0.8	0.8
Comprehensive income (loss), net of tax	(0.5)	21.8
Comprehensive income (loss) attributable to noncontrolling interest, net of tax	0.1	(0.1)
Comprehensive income (loss) attributable to Company common shareholders, net of tax	(0.6)	21.9
Reportable Legal Entities | Parent
Net sales:
Customers	0.0	0.0
Intercompany	16.7	18.2
Net sales	16.7	18.2
Cost of sales	0.0	0.0
Gross profit	16.7	18.2
Selling, general and administrative expenses	8.3	8.0
Operating income	8.4	10.2
Other income (expense)	0.0	0.0
Interest income (expense):
Interest expense	(14.1)	(14.3)
Interest income	12.4	13.2
Interest income (expense), total	(1.7)	(1.1)
Income (loss) before income taxes	6.7	9.1
Income tax (provision) benefit	(1.0)	(4.4)
Equity in net earnings of affiliated companies and subsidiaries	(10.0)	7.7
Net income (loss) including noncontrolling interest	(4.3)	12.4
Less: net income (loss) attributable to noncontrolling interest	0.0	0.0
Net income (loss) attributable to Company common shareholders	(4.3)	12.4
Comprehensive income (loss):
Net income (loss)	(4.3)	12.4
Currency translation gain (loss)	2.9	8.7
Defined benefit plan adjustments, net of tax	0.8	0.8
Comprehensive income (loss), net of tax	(0.6)	21.9
Comprehensive income (loss) attributable to noncontrolling interest, net of tax	0.0	0.0
Comprehensive income (loss) attributable to Company common shareholders, net of tax	(0.6)	21.9
Reportable Legal Entities | Guarantor Subsidiaries
Net sales:
Customers	500.4	466.9
Intercompany	54.9	48.6
Net sales	555.3	515.5
Cost of sales	504.9	444.3
Gross profit	50.4	71.2
Selling, general and administrative expenses	45.8	63.8
Operating income	4.6	7.4
Other income (expense)	(1.5)	3.1
Interest income (expense):
Interest expense	(15.4)	(15.0)
Interest income	1.3	1.3
Interest income (expense), total	(14.1)	(13.7)
Income (loss) before income taxes	(11.0)	(3.2)
Income tax (provision) benefit	(1.4)	3.8
Equity in net earnings of affiliated companies and subsidiaries	2.4	7.1
Net income (loss) including noncontrolling interest	(10.0)	7.7
Less: net income (loss) attributable to noncontrolling interest	0.0	0.0
Net income (loss) attributable to Company common shareholders	(10.0)	7.7
Comprehensive income (loss):
Net income (loss)	(10.0)	7.7
Currency translation gain (loss)	2.9	8.7
Defined benefit plan adjustments, net of tax	0.8	0.8
Comprehensive income (loss), net of tax	(6.3)	17.2
Comprehensive income (loss) attributable to noncontrolling interest, net of tax	0.0	0.0
Comprehensive income (loss) attributable to Company common shareholders, net of tax	(6.3)	17.2
Reportable Legal Entities | Non-Guarantor Subsidiaries
Net sales:
Customers	520.1	451.3
Intercompany	48.5	50.7
Net sales	568.6	502.0
Cost of sales	513.3	454.2
Gross profit	55.3	47.8
Selling, general and administrative expenses	34.0	41.2
Operating income	21.3	6.6
Other income (expense)	(14.1)	11.5
Interest income (expense):
Interest expense	(3.4)	(5.9)
Interest income	0.9	0.6
Interest income (expense), total	(2.5)	(5.3)
Income (loss) before income taxes	4.7	12.8
Income tax (provision) benefit	(2.2)	(5.7)
Equity in net earnings of affiliated companies and subsidiaries	0.0	0.0
Net income (loss) including noncontrolling interest	2.5	7.1
Less: net income (loss) attributable to noncontrolling interest	0.1	0.0
Net income (loss) attributable to Company common shareholders	2.4	7.1
Comprehensive income (loss):
Net income (loss)	2.5	7.1
Currency translation gain (loss)	5.0	8.0
Defined benefit plan adjustments, net of tax	0.3	0.4
Comprehensive income (loss), net of tax	7.8	15.5
Comprehensive income (loss) attributable to noncontrolling interest, net of tax	0.1	(0.1)
Comprehensive income (loss) attributable to Company common shareholders, net of tax	7.7	15.6
Eliminations
Net sales:
Customers	0.0	0.0
Intercompany	(120.1)	(117.5)
Net sales	(120.1)	(117.5)
Cost of sales	(103.4)	(99.3)
Gross profit	(16.7)	(18.2)
Selling, general and administrative expenses	(16.7)	(18.2)
Operating income	0.0	0.0
Other income (expense)	0.0	0.0
Interest income (expense):
Interest expense	13.7	14.5
Interest income	(13.7)	(14.5)
Interest income (expense), total	0.0	0.0
Income (loss) before income taxes	0.0	0.0
Income tax (provision) benefit	0.0	0.0
Equity in net earnings of affiliated companies and subsidiaries	7.6	(14.8)
Net income (loss) including noncontrolling interest	7.6	(14.8)
Less: net income (loss) attributable to noncontrolling interest	0.0	0.0
Net income (loss) attributable to Company common shareholders	7.6	(14.8)
Comprehensive income (loss):
Net income (loss)	7.6	(14.8)
Currency translation gain (loss)	(7.9)	(16.8)
Defined benefit plan adjustments, net of tax	(1.1)	(1.2)
Comprehensive income (loss), net of tax	(1.4)	(32.8)
Comprehensive income (loss) attributable to noncontrolling interest, net of tax	0.0	0.0
Comprehensive income (loss) attributable to Company common shareholders, net of tax	$ (1.4)	$ (32.8)