General (Components of Accumulated Other Comprehensive Income) (Details) - USD ($) $ in Millions	3 Months Ended
	Apr. 03, 2020	Mar. 29, 2019
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance	$ (3,068.3)	$ (2,791.1)
Increase (decrease)	520.0	(6.8)
Income tax impact	(141.4)	(3.6)
Other comprehensive income (loss) before reclassifications, net of income taxes	378.6	(10.4)
Increase (decrease)	(128.0)	7.1
Income tax impact	26.4	(1.7)
Amounts reclassified from accumulated other comprehensive income (loss), net of income taxes	(101.6)	5.4
Total other comprehensive income (loss), net of income taxes	277.0	(5.0)
Ending balance	(2,791.3)	(2,796.1)
Foreign Currency Translation Adjustments
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance	(2,173.3)	(2,098.1)
Increase (decrease)	(131.5)	(7.3)
Income tax impact	(22.4)	(3.5)
Other comprehensive income (loss) before reclassifications, net of income taxes	(153.9)	(10.8)
Increase (decrease)	0.0	0.0
Income tax impact	0.0	0.0
Amounts reclassified from accumulated other comprehensive income (loss), net of income taxes	0.0	0.0
Total other comprehensive income (loss), net of income taxes	(153.9)	(10.8)
Ending balance	(2,327.2)	(2,108.9)
Pension & Postretirement Plan Benefit Adjustments
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance	(781.5)	(691.1)
Increase (decrease)	0.0	0.0
Income tax impact	0.0	0.0
Other comprehensive income (loss) before reclassifications, net of income taxes	0.0	0.0
Increase (decrease)	10.8	7.1
Income tax impact	(2.6)	(1.7)
Amounts reclassified from accumulated other comprehensive income (loss), net of income taxes	8.2	5.4
Total other comprehensive income (loss), net of income taxes	8.2	5.4
Ending balance	(773.3)	(685.7)
Unrealized Gain (Loss) on Available-For-Sale Securities Adjustments
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance	(0.7)	(1.9)
Increase (decrease)	0.7	0.5
Income tax impact	(0.1)	(0.1)
Other comprehensive income (loss) before reclassifications, net of income taxes	0.6	0.4
Increase (decrease)	0.0	0.0
Income tax impact	0.0	0.0
Amounts reclassified from accumulated other comprehensive income (loss), net of income taxes	0.0	0.0
Total other comprehensive income (loss), net of income taxes	0.6	0.4
Ending balance	(0.1)	(1.5)
Cash Flow Hedge Adjustments
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance	(112.8)	0.0
Increase (decrease)	650.8	0.0
Income tax impact	(118.9)	0.0
Other comprehensive income (loss) before reclassifications, net of income taxes	531.9	0.0
Increase (decrease)	(138.8)	0.0
Income tax impact	29.0	0.0
Amounts reclassified from accumulated other comprehensive income (loss), net of income taxes	(109.8)	0.0
Total other comprehensive income (loss), net of income taxes	422.1	0.0
Ending balance	$ 309.3	$ 0.0