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Operating Segments (Narrative) (Details) (USD $)
In Millions, unless otherwise specified
Mar. 31, 2012
Mar. 31, 2011
Mar. 31, 2010
Segment Reporting [Abstract]      
Ownership percentage in affiliate 49.00%    
Number of regional operating segments 5    
Number of regions into a single reporting segment 4    
Investment in affiliate $ 89.7 $ 110.8 $ 101.4