HAMILTON, Bermuda--(BUSINESS WIRE)--Arch Capital Group Ltd. (NASDAQ:ACGL) reports that net income available to Arch common shareholders for the 2015 second quarter was $110.3 million, or $0.88 per share, compared to $202.5 million, or $1.48 per share, for the 2014 second quarter. The Company also reported after-tax operating income available to Arch common shareholders of $146.0 million, or $1.16 per share, for the 2015 second quarter, compared to $160.7 million, or $1.17 per share, for the 201