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Information Provided In Connection With Outstanding Debt Of Subsidiaries (Condensed Consolidating Statement Of Cash Flows) (Detail) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Schedule Of Condensed Consolidating Statement Of Cash Flows [Line Items]      
Net cash flows from operating activities $ (17.7) $ (3.1) $ 301.8
Proceeds from sales of investments 1,370.8 1,893.4 1,339.8
Proceeds from maturities and mandatory calls of investments 450.9 539.3 439.0
Purchases of investments (1,794.9) (2,270.8) (2,057.2)
Change in short-term investments and foreign regulatory deposits 68.3 42.1 51.6
Settlements of foreign currency exchange forward contracts 7.7 0 0
Issuance of intercompany note 0    
Other, net (2.5) (20.1) (14.0)
Cash provided (used) by investing activities 100.3 183.9 (240.8)
Borrowings under intercompany note 0 0  
Activity under revolving credit facility, net 0 0 (50.9)
Activity under stock incentive plans 1.1 4.3 3.1
Repurchase of Company's common shares (49.5) (105.2) 0
Excess tax expense from share-based payment arrangements (0.1) (0.3) (0.3)
Payment of cash dividend to common shareholders (13.1) (14.2) 0
Cash used by financing activities (61.6) (115.4) (48.1)
Effect of exchange rate changes on cash (3.6) 0 0
Change in cash 17.4 65.4 12.9
Cash, beginning of period 83.5 18.1 5.2
Cash, end of period 100.9 83.5 18.1
Argo Group International Holdings, Ltd (Parent Guarantor) [Member]
     
Schedule Of Condensed Consolidating Statement Of Cash Flows [Line Items]      
Net cash flows from operating activities 71.6 (11.2) (2.5)
Proceeds from sales of investments 0 0 0
Proceeds from maturities and mandatory calls of investments 0 0 0
Purchases of investments 0 0 0
Change in short-term investments and foreign regulatory deposits 0 1.8 (0.2)
Settlements of foreign currency exchange forward contracts 1.3    
Issuance of intercompany note 0    
Other, net (0.3) (0.1) (0.8)
Cash provided (used) by investing activities 1.0 1.7 (1.0)
Borrowings under intercompany note (60.6) 36.8  
Activity under revolving credit facility, net     0
Activity under stock incentive plans 1.1 4.4 3.1
Repurchase of Company's common shares 0 (17.5)  
Excess tax expense from share-based payment arrangements 0 0 0
Payment of cash dividend to common shareholders (13.1) (14.2) 0
Cash used by financing activities (72.6) 9.5 3.1
Effect of exchange rate changes on cash 0   0
Change in cash 0 0 (0.4)
Cash, beginning of period 0 0 0.4
Cash, end of period 0 0 0
Argo Group US, Inc. And Subsidiaries (Subsidiary Issuer) [Member]
     
Schedule Of Condensed Consolidating Statement Of Cash Flows [Line Items]      
Net cash flows from operating activities 27.6 (9.7) 117.1
Proceeds from sales of investments 869.3 1,150.6 890.9
Proceeds from maturities and mandatory calls of investments 275.0 332.3 323.8
Purchases of investments (1,123.5) (1,314.5) (1,219.1)
Change in short-term investments and foreign regulatory deposits 61.9 (2.6) 15.0
Settlements of foreign currency exchange forward contracts 0    
Issuance of intercompany note (23.5)    
Other, net (13.7) (14.8) (18.8)
Cash provided (used) by investing activities 45.5 151.0 (8.2)
Borrowings under intercompany note 0 0  
Activity under revolving credit facility, net     (50.9)
Activity under stock incentive plans 0 0 0
Repurchase of Company's common shares (49.5) (87.7)  
Excess tax expense from share-based payment arrangements (0.1) (0.3) (0.3)
Payment of cash dividend to common shareholders 0 (1.3) (52.6)
Cash used by financing activities (49.6) (89.3) (103.8)
Effect of exchange rate changes on cash 0   0
Change in cash 23.5 52.0 5.1
Cash, beginning of period 61.6 9.6 4.5
Cash, end of period 85.1 61.6 9.6
Other Subsidiaries And Eliminations [Member]
     
Schedule Of Condensed Consolidating Statement Of Cash Flows [Line Items]      
Net cash flows from operating activities (156.3) [1] (36.5) [1] 187.2 [1]
Proceeds from sales of investments 501.5 [1] 742.8 [1] 448.9 [1]
Proceeds from maturities and mandatory calls of investments 175.9 [1] 207.0 [1] 115.2 [1]
Purchases of investments (671.4) [1] (956.3) [1] (838.1) [1]
Change in short-term investments and foreign regulatory deposits 6.4 [1] 42.9 [1] 36.8 [1]
Settlements of foreign currency exchange forward contracts 6.4 [1]    
Issuance of intercompany note 23.5 [1]    
Other, net 11.5 [1] (5.2) [1] 5.6 [1]
Cash provided (used) by investing activities 53.8 [1] 31.2 [1] (231.6) [1]
Borrowings under intercompany note 0 [1] 0 [1]  
Activity under revolving credit facility, net     0 [1]
Activity under stock incentive plans 0 [1] (0.1) [1] 0 [1]
Repurchase of Company's common shares 0 [1] 0 [1]  
Excess tax expense from share-based payment arrangements 0 [1] 0 [1] 0 [1]
Payment of cash dividend to common shareholders 100.0 [1] 18.8 [1] 52.6 [1]
Cash used by financing activities 100.0 [1] 18.7 [1] 52.6 [1]
Effect of exchange rate changes on cash (3.6) [1]   0 [1]
Change in cash (6.1) [1] 13.4 [1] 8.2 [1]
Cash, beginning of period 21.9 [1] 8.5 [1] 0.3 [1]
Cash, end of period 15.8 [1] 21.9 [1] 8.5 [1]
Consolidating Adjustments [Member]
     
Schedule Of Condensed Consolidating Statement Of Cash Flows [Line Items]      
Net cash flows from operating activities 39.4 [2] (54.3) [2] 0 [2]
Proceeds from sales of investments 0 [2] 0 [2] 0 [2]
Proceeds from maturities and mandatory calls of investments 0 [2] 0 [2] 0 [2]
Purchases of investments 0 [2] 0 [2] 0 [2]
Change in short-term investments and foreign regulatory deposits 0 [2] 0 [2] 0 [2]
Settlements of foreign currency exchange forward contracts 0 [2]    
Issuance of intercompany note 0 [2]    
Other, net 0 [2] 0 [2] 0 [2]
Cash provided (used) by investing activities 0 [2] 0 [2] 0 [2]
Borrowings under intercompany note 60.6 [2] (36.8) [2]  
Activity under revolving credit facility, net     0 [2]
Activity under stock incentive plans 0 [2] 0 [2] 0 [2]
Repurchase of Company's common shares 0 [2] 0 [2]  
Excess tax expense from share-based payment arrangements 0 [2] 0 [2] 0 [2]
Payment of cash dividend to common shareholders 100.0 [2] (17.5) [2] 0 [2]
Cash used by financing activities (39.4) [2] (54.3) [2] 0 [2]
Effect of exchange rate changes on cash 0 [2]   0 [2]
Change in cash 0 [2] 0 [2] 0 [2]
Cash, beginning of period 0 [2] 0 [2] 0 [2]
Cash, end of period $ 0 [2] $ 0 [2] $ 0 [2]
[1] Includes all other subsidiaries of Argo Group International Holdings, Ltd and all intercompany eliminations
[2] Includes all Argo Group parent company eliminations