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Accounting Policies - Additional Information (Details)
0 Months Ended 3 Months Ended
Jul. 01, 2014
Jun. 02, 2014
Mar. 31, 2015
Jun. 02, 2014
Accounting Policies [Abstract]        
Stock split conversion ratio 1.5us-gaap_StockholdersEquityNoteStockSplitConversionRatio1 1.5us-gaap_StockholdersEquityNoteStockSplitConversionRatio1    
Stock split, description     A three-for-two stock split  
Percentage of stock dividend payable       50.00%tmk_PercentageOfStockDividendPayableToStockholdersAsPerThreeForTwoSplitOfCommonStock
Record date for three for two stock split     Jun. 02, 2014  
Stock split, payment date     Jul. 01, 2014