Accumulated Other Comprehensive Loss (Changes in AOCI by Component) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 29, 2020	Mar. 31, 2019
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance	$ 2,714.7	$ 2,229.7
Other comprehensive income/(loss) before reclassifications	(64.9)	20.3
Amounts reclassified from AOCI	1.2	3.1
Other comprehensive income (loss)	(63.7)	23.4
Ending balance	2,753.0	2,349.5
Foreign Currency Translation
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance	(150.4)	(181.5)
Other comprehensive income/(loss) before reclassifications	(61.3)	17.0
Amounts reclassified from AOCI	0.0	0.0
Other comprehensive income (loss)	(61.3)	17.0
Ending balance	(211.7)	(164.5)
Cash Flow Hedges and Other
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance	(2.3)	(4.9)
Other comprehensive income/(loss) before reclassifications	(3.6)	3.3
Amounts reclassified from AOCI	(2.3)	(1.5)
Other comprehensive income (loss)	(5.9)	1.8
Ending balance	(8.2)	(3.1)
Pension and Postretirement Benefits
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance	(323.1)	(306.8)
Other comprehensive income/(loss) before reclassifications	0.0	0.0
Amounts reclassified from AOCI	3.5	4.6
Other comprehensive income (loss)	3.5	4.6
Ending balance	(319.6)	(302.2)
Total
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance	(475.8)	(493.2)
Other comprehensive income (loss)	(63.7)	23.4
Ending balance	$ (539.5)	$ (469.8)