Accumulated Other Comprehensive Loss - Changes in AOCI by Component (Details) - USD ($) $ in Millions	3 Months Ended				6 Months Ended
	Jun. 28, 2020	Mar. 29, 2020	Jun. 30, 2019	Mar. 31, 2019	Jun. 28, 2020	Jun. 30, 2019
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance	$ 2,753.0	$ 2,714.7	$ 2,349.5	$ 2,229.7	$ 2,714.7	$ 2,229.7
Other comprehensive loss before reclassifications	1.2		(4.1)		(63.7)	16.1
Amounts reclassified from AOCI	7.3		5.7		8.5	8.9
Net other comprehensive income/(loss)	8.5	(63.7)	1.6	23.4	(55.2)	25.0
Ending balance	2,879.9	2,753.0	2,473.0	2,349.5	2,879.9	2,473.0
Foreign Currency Translation
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance	(211.7)	(150.4)	(164.5)	(181.5)	(150.4)	(181.5)
Other comprehensive loss before reclassifications	1.4		(4.6)		(59.9)	12.4
Amounts reclassified from AOCI	0.0		0.0		0.0	0.0
Net other comprehensive income/(loss)	1.4		(4.6)		(59.9)	12.4
Ending balance	(210.3)	(211.7)	(169.1)	(164.5)	(210.3)	(169.1)
Cash Flow Hedges and Other
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance	(8.2)	(2.3)	(3.1)	(4.9)	(2.3)	(4.9)
Other comprehensive loss before reclassifications	(0.2)		0.5		(3.8)	3.7
Amounts reclassified from AOCI	4.1		0.8		1.8	(0.6)
Net other comprehensive income/(loss)	3.9		1.3		(2.0)	3.1
Ending balance	(4.3)	(8.2)	(1.8)	(3.1)	(4.3)	(1.8)
Pension and Postretirement Benefits
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance	(319.6)	(323.1)	(302.2)	(306.8)	(323.1)	(306.8)
Other comprehensive loss before reclassifications	0.0		0.0		0.0	0.0
Amounts reclassified from AOCI	3.2		4.9		6.7	9.5
Net other comprehensive income/(loss)	3.2		4.9		6.7	9.5
Ending balance	(316.4)	(319.6)	(297.3)	(302.2)	(316.4)	(297.3)
Total
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance	(539.5)	(475.8)	(469.8)	(493.2)	(475.8)	(493.2)
Net other comprehensive income/(loss)	8.5	(63.7)	1.6	23.4
Ending balance	$ (531.0)	$ (539.5)	$ (468.2)	$ (469.8)	$ (531.0)	$ (468.2)