Income Taxes Uncertain tax positions (Details) - USD ($) $ in Millions	6 Months Ended	12 Months Ended
Dec. 31, 2015	Dec. 31, 2016	Jun. 27, 2015
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Unrecognized tax benefits, beginning balance	$ 324.0	$ 288.1	$ 160.1
Positions related to the current year	22.9	45.5	38.9
Positions related to prior years		8.6	128.1
Settlements with taxing authorities	(15.3)	(2.4)	(1.4)
Lapse of statutes of limitation		(5.3)	(1.7)
Positions related to prior years	(43.5)
Unrecognized tax benefits, ending balance	$ 288.1	$ 334.5	$ 324.0

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

No definition available.

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- Definition

Amount of unrecognized tax benefits.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 15A
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=65882285&loc=SL6600010-109319

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Unrecognized Tax Benefit
-URI http://asc.fasb.org/extlink&oid=6527854

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Amount of decrease in unrecognized tax benefits resulting from tax positions taken in prior period tax returns.

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Amount of decrease in unrecognized tax benefits resulting from settlements with taxing authorities.

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Amount of increase in unrecognized tax benefits resulting from tax positions that have been or will be taken in current period tax return.

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Amount of decrease in unrecognized tax benefits resulting from lapses of applicable statutes of limitations.

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