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Other Comprehensive Income or Loss (Narrative) (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 15, 2013
Jun. 16, 2012
Jun. 15, 2013
Jun. 16, 2012
Other Comprehensive Income or Loss [Abstract]        
Comprehensive earnings $ 26.1 $ 102.1 $ 128.4 $ 210.1