General General (Components of Accumulated Other Comprehensive Income) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 28, 2014	Mar. 29, 2013
Accumulated Other Comprehensive Income Loss Total [Roll Forward]
Beginning balance	$ 214.5	$ (59.2)
Other comprehensive income (loss) before reclassifications:
Increase (decrease)	6.9	(189.0)
Income tax benefit (expense)	(6.2)	(25.3)
Other comprehensive income (loss) before reclassifications, net of income taxes	0.7	(214.3)
Amounts reclassified from accumulated other comprehensive income (loss):
Increase (decrease)	5.3	8.3
Income tax expense	(1.9)	(2.8)
Amounts reclassified from accumulated other comprehensive income (loss), net of income taxes	3.4	5.5
Net current period other comprehensive income, net of income taxes	4.1	(208.8)
Ending balance	218.6	(268.0)
Foreign currency translation adjustments
Accumulated Other Comprehensive Income Loss Total [Roll Forward]
Beginning balance	413.2	475.3
Other comprehensive income (loss) before reclassifications:
Increase (decrease)	(7.2)	(256.5)
Income tax benefit (expense)	0	0
Other comprehensive income (loss) before reclassifications, net of income taxes	(7.2)	(256.5)
Amounts reclassified from accumulated other comprehensive income (loss):
Increase (decrease)	0	0
Income tax expense	0	0
Amounts reclassified from accumulated other comprehensive income (loss), net of income taxes	0	0
Net current period other comprehensive income, net of income taxes	(7.2)	(256.5)
Ending balance	406.0	218.8
Pension and post-retirement plan benefit adjustments
Accumulated Other Comprehensive Income Loss Total [Roll Forward]
Beginning balance	(366.7)	(655.7)
Other comprehensive income (loss) before reclassifications:
Increase (decrease)	(5.5)	0
Income tax benefit (expense)	1.1	0
Other comprehensive income (loss) before reclassifications, net of income taxes	(4.4)	0
Amounts reclassified from accumulated other comprehensive income (loss):
Increase (decrease)	5.3	8.3
Income tax expense	(1.9)	(2.8)
Amounts reclassified from accumulated other comprehensive income (loss), net of income taxes	3.4	5.5
Net current period other comprehensive income, net of income taxes	(1.0)	5.5
Ending balance	(367.7)	(650.2)
Unrealized gain on available-for-sale securities
Accumulated Other Comprehensive Income Loss Total [Roll Forward]
Beginning balance	168.0	121.2
Other comprehensive income (loss) before reclassifications:
Increase (decrease)	19.6	67.5
Income tax benefit (expense)	(7.3)	(25.3)
Other comprehensive income (loss) before reclassifications, net of income taxes	12.3	42.2
Amounts reclassified from accumulated other comprehensive income (loss):
Increase (decrease)	0	0
Income tax expense	0	0
Amounts reclassified from accumulated other comprehensive income (loss), net of income taxes	0	0
Net current period other comprehensive income, net of income taxes	12.3	42.2
Ending balance	$ 180.3	$ 163.4