Post Retirement Plans (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
Apr. 01, 2017	Apr. 02, 2016	Dec. 31, 2016
Pension and Other Postretirement Benefit Expense [Abstract]
Estimated net actuarial loss to be amortized from accumulated other comprehensive loss	$ 2.2
Estimated prior service cost to be amortized from accumulated other comprehensive loss	0.2
Contribution to defined benefit pension plans	0.8	$ 1.1	$ 10.4
Expected total contribution to defined benefit pension plans	$ 4.4

The increase in the fair value of plan assets from contributions made by the employer.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (b)(3)
-URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920

+ Details

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- Definition

Amount included in accumulated other comprehensive income (AOCI) related to gain (loss) expected to be recognized as components of net periodic benefit cost for the fiscal year that follows the most recent annual statement of financial position.

+ References

No definition available.

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- Definition

Amount included in accumulated other comprehensive income (AOCI) related to prior service cost (credit) expected to be recognized as components of net periodic benefit cost for the fiscal year that follows the most recent annual statement of financial position.

+ References

No definition available.

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- Definition

Amount of employer's best estimate of contributions expected to be paid to the plan in the current remaining fiscal period.

+ References

No definition available.

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- References

No definition available.

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