Financial Instruments (Narrative) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		3 Months Ended
Mar. 29, 2013 derivatives	Dec. 31, 2012 derivatives	Mar. 29, 2013 Not Designated as Hedging Instrument [Member]	Mar. 30, 2012 Not Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Number of derivative require collateral security	0	0
Gain (loss) on derivative instruments not designated as cash flow hedges			$ (10.1)	$ 5.5
Expected pre-tax gain on derivatives to be reclassified into earnings in the next twelve months	2.4
Forward pricing agreements	18.0	37.7
Fair value forward pricing agreements	17.2	38.0
Unrealized gain (loss) related to forward pricing agreements	$ (0.8)	$ 0.3

The net change in the difference between the fair value and the carrying value, or in the comparative fair values, of derivative instruments, including options, swaps, futures, and forward contracts, held at each balance sheet date, that was included in earnings for the period.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 95

-Paragraph 28

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 28

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3602-108585

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration