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Retirement Benefit Plans (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended
Mar. 31, 2012
Apr. 02, 2011
Defined Benefit Plan Disclosure [Line Items]    
Other Comprehensive Income, Reclassification of Defined Benefit Plan's Net Gain (Loss) Recognized in Net Periodic Benefit Cost, before Tax $ 1.0 $ 1.8
Pension Plans, Defined Benefit [Member]
   
Defined Benefit Plan Disclosure [Line Items]    
Service Cost 2.5 2.5
Interest Cost 2.3 2.5
Expected Return on Plan Assets (1.4) (1.6)
Settlement/Curtailment 0 1.0
Net Amortization 1.0 0.9
Net Periodic Benefit Cost 4.4 5.3
Other Postretirement Benefit Plans, Defined Benefit [Member]
   
Defined Benefit Plan Disclosure [Line Items]    
Service Cost 0 0
Interest Cost 0.4 0.5
Expected Return on Plan Assets 0 0
Settlement/Curtailment 0 0
Net Amortization 0 (0.1)
Net Periodic Benefit Cost $ 0.4 $ 0.4