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Derivative Instruments (Narrative) (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended
Mar. 31, 2012
Apr. 02, 2011
Dec. 31, 2011
Derivative Instruments [Abstract]      
Notional amount of receive-variable/pay-fixed interest rate swaps $ 250.0    
Receive-variable/pay-fixed interest rate swaps, maturity period August 2017    
Net AOCI balance (10.3)   (50.8)
Net current deferred gains expected to be realized 5.4    
Net derivative gains (losses) on closed hedge instruments in AOCI that will be realized in earnings when the hedged items impact earnings $ (0.7) $ 5.8