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Income Taxes (Tables)
6 Months Ended
Oct. 01, 2011
Income Taxes [Abstract] 
Reconciliation of unrecognized tax benefits, excluding interest and penalties
 
                                 
    Three Months Ended     Six Months Ended  
    October 1,
    October 2,
    October 1,
    October 2,
 
    2011     2010     2011     2010  
    (millions)  
 
Unrecognized tax benefits beginning balance
  $ 127.0     $ 111.5     $ 125.0     $ 96.2  
Additions related to current period tax positions
    0.9       1.3       1.9       2.1  
Additions related to prior period tax positions
    0.1       2.5       0.2       27.3  
Reductions related to prior period tax positions
    (0.3 )     (0.1 )     (0.7 )     (8.2 )
Additions (reductions) related to foreign currency translation
    (2.9 )     3.5       (1.6 )     1.3  
                                 
Unrecognized tax benefits ending balance
  $ 124.8     $ 118.7     $ 124.8     $ 118.7  
                                 
Reconciliation of accrued interest and penalties related to unrecognized tax benefit
 
                                 
    Three Months Ended     Six Months Ended  
    October 1,
    October 2,
    October 1,
    October 2,
 
    2011     2010     2011     2010  
    (millions)  
 
Accrued interest and penalties beginning balance
  $ 33.8     $ 30.2     $ 31.4     $ 29.8  
Net additions charged to expense
    2.1       1.7       4.1       4.7  
Reductions related to prior period tax positions
                      (2.1 )
Additions (reductions) related to foreign currency translation
    (0.5 )     0.7       (0.1 )     0.2  
                                 
Accrued interest and penalties ending balance
  $ 35.4     $ 32.6     $ 35.4     $ 32.6