Home Depot spent US$43 million in its third quarter dealing with the fallout of one of the largest ever data breaches, highlighting the costly nature of security failures.

The retailer said in a regulatory filing on Tuesday that it expects $15 million of that cost will be reimbursed by a $100 million network security and privacy liability insurance policy.

The $43 million was spent on investigations, providing identity theft protection services to consumers, increased call center staffing and other legal and professional services.

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