Comprehensive Income, Accumulated Other Comprehensive Loss, Net of Related Tax (Details) - USD ($) $ in Millions		3 Months Ended						9 Months Ended
		Sep. 27, 2020	Jun. 28, 2020	Mar. 29, 2020	Sep. 29, 2019	Jun. 30, 2019	Mar. 31, 2019	Sep. 27, 2020	Sep. 29, 2019
Components of Accumulated Other Comprehensive Loss, Net of Tax [Roll Forward]
Balance at beginning of period	[1]			$ 1,402.7				$ 1,402.7
Total other comprehensive income (loss), net of tax		$ 6.0	$ 12.4	(39.2)	$ (17.0)	$ (20.3)	$ 2.4	(20.8)	$ (34.8)
Balance at end of period	[2]	1,438.1						1,438.1
Accumulated Other Comprehensive Income (Loss) [Member]
Components of Accumulated Other Comprehensive Loss, Net of Tax [Roll Forward]
Balance at beginning of period				(290.4)				(290.4)
Other comprehensive income (loss) before reclassifications								(32.1)
Amounts reclassified from AOCI								11.1
Total other comprehensive income (loss), net of tax		5.5	$ 11.3	(37.8)	$ (16.2)	$ (20.1)	$ 1.9	(21.0)
Balance at end of period		(311.4)						(311.4)
Foreign Currency Translation Adjustment [Member]
Components of Accumulated Other Comprehensive Loss, Net of Tax [Roll Forward]
Balance at beginning of period				(200.2)				(200.2)
Other comprehensive income (loss) before reclassifications								(28.9)
Amounts reclassified from AOCI								0.0
Total other comprehensive income (loss), net of tax								(28.9)
Balance at end of period		(229.1)						(229.1)
Unrecognized Pension Costs [Member]
Components of Accumulated Other Comprehensive Loss, Net of Tax [Roll Forward]
Balance at beginning of period				(96.1)				(96.1)
Other comprehensive income (loss) before reclassifications								0.0
Amounts reclassified from AOCI								11.1
Total other comprehensive income (loss), net of tax								11.1
Balance at end of period		(85.0)						(85.0)
Net Gain (Loss) on Derivative Instruments [Member]
Components of Accumulated Other Comprehensive Loss, Net of Tax [Roll Forward]
Balance at beginning of period				$ 5.9				5.9
Other comprehensive income (loss) before reclassifications								(3.2)
Amounts reclassified from AOCI								0.0
Total other comprehensive income (loss), net of tax								(3.2)
Balance at end of period		$ 2.7						$ 2.7

[1] Condensed from audited financial statements

[2] Unaudited