General General (Components of Accumulated Other Comprehensive Income) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 27, 2014	Jun. 28, 2013	Jun. 27, 2014	Jun. 28, 2013
Accumulated Other Comprehensive Income Loss Total [Roll Forward]
Beginning balance	$ 218.6	$ (268.0)	$ 214.5	$ (59.2)
Other comprehensive income (loss) before reclassifications:
Increase (decrease)	117.8	(108.2)	124.7	(297.2)
Income tax benefit (expense)	(22.1)	(7.9)	(28.3)	(33.2)
Other comprehensive income (loss) before reclassifications, net of income taxes	95.7	(116.1)	96.4	(330.4)
Amounts reclassified from accumulated other comprehensive income (loss):
Increase (decrease)	(13.8)	8.4	(8.5)	16.8
Income tax (expense) benefit	5.3	(2.9)	3.4	(5.8)
Amounts reclassified from accumulated other comprehensive income (loss), net of income taxes	(8.5)	5.5	(5.1)	11.0
Total other comprehensive income (loss), net of income taxes	87.2	(110.6)	91.3	(319.4)
Ending balance	305.8	(378.6)	305.8	(378.6)
Foreign currency translation adjustments
Accumulated Other Comprehensive Income Loss Total [Roll Forward]
Beginning balance	406.0	218.8	413.2	475.3
Other comprehensive income (loss) before reclassifications:
Increase (decrease)	59.1	(129.1)	51.9	(385.6)
Income tax benefit (expense)	0	0	0	0
Other comprehensive income (loss) before reclassifications, net of income taxes	59.1	(129.1)	51.9	(385.6)
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	59.1	(129.1)	51.9	(385.6)
Ending balance	465.1	89.7	465.1	89.7
Pension and post-retirement plan benefit adjustments
Accumulated Other Comprehensive Income Loss Total [Roll Forward]
Beginning balance	(367.7)	(650.2)	(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)	5.4	8.4	10.7	16.8
Income tax (expense) benefit	(1.9)	(2.9)	(3.8)	(5.8)
Amounts reclassified from accumulated other comprehensive income (loss), net of income taxes	3.5	5.5	6.9	11.0
Total other comprehensive income (loss), net of income taxes	3.5	5.5	2.5	11.0
Ending balance	(364.2)	(644.7)	(364.2)	(644.7)
Unrealized gain on available-for-sale securities
Accumulated Other Comprehensive Income Loss Total [Roll Forward]
Beginning balance	180.3	163.4	168.0	121.2
Other comprehensive income (loss) before reclassifications:
Increase (decrease)	58.7	20.9	78.3	88.4
Income tax benefit (expense)	(22.1)	(7.9)	(29.4)	(33.2)
Other comprehensive income (loss) before reclassifications, net of income taxes	36.6	13.0	48.9	55.2
Amounts reclassified from accumulated other comprehensive income (loss):
Increase (decrease)	(19.2)	0	(19.2)	0
Income tax (expense) benefit	7.2	0	7.2	0
Amounts reclassified from accumulated other comprehensive income (loss), net of income taxes	(12.0)	0	(12.0)	0
Total other comprehensive income (loss), net of income taxes	24.6	13.0	36.9	55.2
Ending balance	$ 204.9	$ 176.4	$ 204.9	$ 176.4