General (Components of Accumulated Other Comprehensive Income) (Details) - USD ($) $ in Millions		3 Months Ended
	Jan. 01, 2018	Mar. 30, 2018	Mar. 31, 2017
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance	$ (1,994.2)	$ (1,994.2)
Total other comprehensive income (loss), net of income taxes		300.7	$ 316.5
Ending balance		(1,844.7)
Foreign Currency Translation Adjustments
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance	(1,422.1)	(1,422.1)	(2,398.2)
Adoption of accounting standards	(43.8)
Increase (decrease)		294.1	304.3
Income tax impact		0.0	0.0
Other comprehensive income (loss) before reclassifications, net of income taxes		294.1	304.3
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		294.1	304.3
Ending balance	(1,465.9)	(1,171.8)	(2,093.9)
Pension & Postretirement Plan Benefit Adjustments
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance	(571.2)	(571.2)	(642.2)
Adoption of accounting standards	(107.2)
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)		9.3	7.6
Income tax impact		(2.2)	(2.7)
Amounts reclassified from accumulated other comprehensive income (loss), net of income taxes		7.1	4.9
Total other comprehensive income (loss), net of income taxes		7.1	4.9
Ending balance	(678.4)	(671.3)	(637.3)
Unrealized Gain (Loss) on Available-For-Sale Securities Adjustments
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance	(0.9)	(0.9)	18.7
Adoption of accounting standards	(0.2)
Increase (decrease)		(0.8)	11.7
Income tax impact		0.3	(4.4)
Other comprehensive income (loss) before reclassifications, net of income taxes		(0.5)	7.3
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		(0.5)	7.3
Ending balance	(1.1)	(1.6)	26.0
Accumulated Other Comprehensive Income (Loss)
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance	(1,994.2)	(1,994.2)	(3,021.7)
Adoption of accounting standards	(151.2)
Increase (decrease)		293.3	316.0
Income tax impact		0.3	(4.4)
Other comprehensive income (loss) before reclassifications, net of income taxes		293.6	311.6
Increase (decrease)		9.3	7.6
Income tax impact		(2.2)	(2.7)
Amounts reclassified from accumulated other comprehensive income (loss), net of income taxes		7.1	4.9
Total other comprehensive income (loss), net of income taxes		300.7	316.5
Ending balance	$ (2,145.4)	$ (1,844.7)	$ (2,705.2)