General General (Components of Accumulated Other Comprehensive Income) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 26, 2014	Sep. 27, 2013	Sep. 26, 2014	Sep. 27, 2013
Accumulated Other Comprehensive Income Loss Total [Roll Forward]
Beginning balance	$ 305.8	$ (378.6)	$ 214.5	$ (59.2)
Other comprehensive income (loss) before reclassifications:
Increase (decrease)	(696.5)	383.6	(571.8)	86.4
Income tax benefit (expense)	9.8	(35.7)	(18.5)	(68.9)
Other comprehensive income (loss) before reclassifications, net of income taxes	(686.7)	347.9	(590.3)	17.5
Amounts reclassified from accumulated other comprehensive income (loss):
Increase (decrease)	1.7	8.4	(6.8)	25.2
Income tax (expense) benefit	(0.6)	(2.9)	2.8	(8.7)
Amounts reclassified from accumulated other comprehensive income (loss), net of income taxes	1.1	5.5	(4.0)	16.5
Total other comprehensive income (loss), net of income taxes	(685.6)	353.4	(594.3)	34.0
Ending balance	(379.8)	(25.2)	(379.8)	(25.2)
Foreign currency translation adjustments
Accumulated Other Comprehensive Income Loss Total [Roll Forward]
Beginning balance	465.1	89.7	413.2	475.3
Other comprehensive income (loss) before reclassifications:
Increase (decrease)	(670.5)	288.2	(618.6)	(97.4)
Income tax benefit (expense)	0	0	0	0
Other comprehensive income (loss) before reclassifications, net of income taxes	(670.5)	288.2	(618.6)	(97.4)
Amounts reclassified from accumulated other comprehensive income (loss):
Increase (decrease)	0	0	0	0
Income tax (expense) benefit	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	(670.5)	288.2	(618.6)	(97.4)
Ending balance	(205.4)	377.9	(205.4)	377.9
Pension and post-retirement plan benefit adjustments
Accumulated Other Comprehensive Income Loss Total [Roll Forward]
Beginning balance	(364.2)	(644.7)	(366.7)	(655.7)
Other comprehensive income (loss) before reclassifications:
Increase (decrease)	0	0	(5.5)	0
Income tax benefit (expense)	0	0	1.1	0
Other comprehensive income (loss) before reclassifications, net of income taxes	0	0	(4.4)	0
Amounts reclassified from accumulated other comprehensive income (loss):
Increase (decrease)	6.0	8.4	16.7	25.2
Income tax (expense) benefit	(2.2)	(2.9)	(6.0)	(8.7)
Amounts reclassified from accumulated other comprehensive income (loss), net of income taxes	3.8	5.5	10.7	16.5
Total other comprehensive income (loss), net of income taxes	3.8	5.5	6.3	16.5
Ending balance	(360.4)	(639.2)	(360.4)	(639.2)
Unrealized gain on available-for-sale securities
Accumulated Other Comprehensive Income Loss Total [Roll Forward]
Beginning balance	204.9	176.4	168.0	121.2
Other comprehensive income (loss) before reclassifications:
Increase (decrease)	(26.0)	95.4	52.3	183.8
Income tax benefit (expense)	9.8	(35.7)	(19.6)	(68.9)
Other comprehensive income (loss) before reclassifications, net of income taxes	(16.2)	59.7	32.7	114.9
Amounts reclassified from accumulated other comprehensive income (loss):
Increase (decrease)	(4.3)	0	(23.5)	0
Income tax (expense) benefit	1.6	0	8.8	0
Amounts reclassified from accumulated other comprehensive income (loss), net of income taxes	(2.7)	0	(14.7)	0
Total other comprehensive income (loss), net of income taxes	(18.9)	59.7	18.0	114.9
Ending balance	$ 186.0	$ 236.1	$ 186.0	$ 236.1