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Debt (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended 12 Months Ended 3 Months Ended 1 Months Ended
Mar. 31, 2013
Dec. 31, 2012
Mar. 31, 2013
Top Tier Foreign Subsidiaries [Member]
May 31, 2011
Revolving Credit Facility [Member]
Debt (Additional Textual) [Abstract]        
Credit facility       $ 130
Additional credit facility       50
Credit facility, period       5 years
Credit facility expiring       May 18, 2016
Letters of credit       50
Capital stock of top-tier foreign subsidiaries     65.00%  
Debt (Textual) [Abstract]        
Capital lease obligations, total 2.5      
Outstanding letters of credit 1.8      
Remaining borrowing capacity 128.2      
The fees on the unused portion of the Credit Facility 0.35%      
Estimated fair value of total debt 2.4 2.1    
Share repurchases   10    
Percentage of repurchases of shares   1.50    
Dividends declared and paid   $ 10