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Leases - Cash flows (Details) $ in Millions	9 Months Ended
	Sep. 29, 2019 USD ($)
Leases
Operating cash flows from operating leases	$ 8.8
Operating cash flows from finance leases	0.2
Financing cash flows from finance leases	1.2
Total cash paid for amounts included in the measurement of lease liabilities	10.2
Finance lease liabilities arising from obtaining right-of-use assets	1.1
Operating lease liabilities arising from obtaining right-of-use assets	$ 11.8

X

- Definition

Amount of interest paid on finance lease liability.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 20
-Section 50
-Paragraph 4
-Subparagraph (g)(1)
-URI http://asc.fasb.org/extlink&oid=77888426&loc=SL77918686-209980

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-URI http://asc.fasb.org/extlink&oid=77888419&loc=SL77918643-209977

+ Details

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X

- Definition

Amount of cash outflow for principal payment on finance lease.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 20
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X

- References

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X

- Definition

Amount of cash outflow from operating lease, excluding payments to bring another asset to condition and location necessary for its intended use.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 20
-Section 45
-Paragraph 5
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=77888419&loc=SL77918643-209977

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X

- Definition

Amount of increase in right-of-use asset obtained in exchange for finance lease liability.

+ References

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- Definition

Amount of increase in right-of-use asset obtained in exchange for operating lease liability.

+ References

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- Definition

Amount of cash outflows for operating lease and finance lease.

+ References

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