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Income Taxes Liability for Unrecognized Tax Benefits (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended 3 Months Ended 12 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Mar. 31, 2012
Jun. 29, 2013
Italy [Member]
Sep. 28, 2013
Germany [Member]
Mar. 31, 2014
VAG [Member]
Income Tax Examination [Line Items]            
Unrecognized tax benefits, income tax penalties and interest accrued $ 9.9 $ 10.5        
Unrecognized tax benefits, income tax penalties and interest expense (0.6) 0.9 0.8      
Income Tax Examination, Penalties and Interest Expense       0.7 0.4 0.4
Liability for unrecognized tax benefits 23.6 27.5        
Reconciliation of Unrecognized Tax Benefits [Roll Forward]            
Balance at beginning of period 24.0 29.6        
Additions based on tax positions related to the current year 2.5 0        
Additions for tax positions of prior years 0 0        
Reductions for tax positions of prior years 0 0        
Settlements (0.8) (5.0)        
Reductions due to lapse of applicable statute of limitations (4.7) (0.8)        
Cumulative translation adjustment (0.1) 0.2        
Balance at end of period $ 20.9 $ 24.0 $ 29.6