Business Overview - Narrative (Details) $ in Millions		3 Months Ended		6 Months Ended
	Jan. 01, 2020 USD ($)	Jun. 26, 2020 USD ($)	Jun. 28, 2019 USD ($)	Jun. 26, 2020 USD ($)	Jun. 28, 2019 USD ($)	Jun. 26, 2020 JPY (¥)	Dec. 31, 2019 USD ($)
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
(Loss) gain in OCI related to net investment hedge		$ 3.1	$ (7.1)	$ 4.0	$ 0.1
Accounting Standards Update [Extensible List]	us-gaap:AccountingStandardsUpdate201613Member
Allowance for accounts, unbilled and financing receivables		125.1		125.1			$ 82.1
Retained earnings		$ 4,187.8		$ 4,187.8			4,128.8
Cumulative Effect, Period of Adoption, Adjustment
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Allowance for accounts, unbilled and financing receivables	$ 40.0						$ 40.0
Retained earnings	$ (31.3)
Yen variable interest rate term loan due 2022
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Term loan facility, aggregate amount | ¥						¥ 13,800,000,000