Updates to Significant Accounting Policies - Financial Impact On Cash Flow (Details) - USD ($) $ in Millions		6 Months Ended
		Jun. 29, 2018	Jun. 30, 2017
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Net cash provided by operating activities		$ 267.8	$ 253.4	[1]
Net cash used in investing activities		(384.8)	(110.4)	[1]
Net cash provided by financing activities		$ 337.6	14.7	[1]
Scenario, Previously Reported [Member] | Accounting Standards Update 2016-15 [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Net cash provided by operating activities			248.7
Net cash used in investing activities			(110.3)
Net cash provided by financing activities			19.3
Restatement Adjustment [Member] | Accounting Standards Update 2016-15 [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Net cash provided by operating activities	[2]		4.7
Net cash used in investing activities	[2]		(0.1)
Net cash provided by financing activities	[2]		$ (4.6)

[1] See Note 2 for a summary of adjustments

[2] Adjusted to reflect the adoption of Statement of Cash Flows