Business Overview - Accumulated Other Comprehensive Income (Details) - USD ($) $ in Millions	3 Months Ended						9 Months Ended
	Sep. 25, 2020	Jun. 26, 2020	Mar. 27, 2020	Sep. 27, 2019	Jun. 28, 2019	Mar. 29, 2019	Sep. 25, 2020	Sep. 27, 2019
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance			$ 7,400.2				$ 7,400.2
Other comprehensive income (loss) before reclassifications, net of income taxes	$ 63.9			$ (52.5)			(36.4)	$ (34.5)
Amounts reclassified from accumulated other comprehensive income (loss):
Increase (Decrease)	1.2			0.7			1.2	2.1
Income tax impact	(0.2)			(0.2)			(0.2)	(0.6)
Amounts reclassified from accumulated other comprehensive income (loss), net of income taxes	1.0			0.5			1.0	1.5
Total other comprehensive income (loss), net of income taxes	64.9			(52.0)			(35.4)	(33.0)
Ending balance	7,688.1						7,688.1
Foreign currency translation adjustments
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance	(79.1)		21.2	(11.3)		$ (29.3)	21.2	(29.3)
Other comprehensive income (loss) before reclassifications, net of income taxes	63.9			(52.5)			(36.4)	(34.5)
Amounts reclassified from accumulated other comprehensive income (loss):
Increase (Decrease)	0.0			0.0			0.0	0.0
Income tax impact	0.0			0.0			0.0	0.0
Amounts reclassified from accumulated other comprehensive income (loss), net of income taxes	0.0			0.0			0.0	0.0
Total other comprehensive income (loss), net of income taxes	63.9			(52.5)			(36.4)	(34.5)
Ending balance	(15.2)	$ (79.1)		(63.8)	$ (11.3)		(15.2)	(63.8)
Pension adjustments
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance	(77.5)		(77.5)	(56.3)		(57.3)	(77.5)	(57.3)
Other comprehensive income (loss) before reclassifications, net of income taxes	0.0			0.0			0.0	0.0
Amounts reclassified from accumulated other comprehensive income (loss):
Increase (Decrease)	1.2			0.7			1.2	2.1
Income tax impact	(0.2)			(0.2)			(0.2)	(0.6)
Amounts reclassified from accumulated other comprehensive income (loss), net of income taxes	1.0			0.5			1.0	1.5
Total other comprehensive income (loss), net of income taxes	1.0			0.5			1.0	1.5
Ending balance	(76.5)	(77.5)		(55.8)	(56.3)		(76.5)	(55.8)
Accumulated Other Comprehensive Income (Loss)
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance	(156.6)	(193.6)	(56.3)	(67.6)	(69.4)	(86.6)	(56.3)	(86.6)
Amounts reclassified from accumulated other comprehensive income (loss):
Total other comprehensive income (loss), net of income taxes	64.9	37.0	(137.3)	(52.0)	1.8	17.2
Ending balance	$ (91.7)	$ (156.6)	$ (193.6)	$ (119.6)	$ (67.6)	$ (69.4)	$ (91.7)	$ (119.6)