Quarterly report pursuant to Section 13 or 15(d)

Condensed Consolidated Balance Sheets (Unaudited) (Parenthetical)

v3.8.0.1
Condensed Consolidated Balance Sheets (Unaudited) (Parenthetical) - $ / shares
shares in Millions
Sep. 30, 2017
Dec. 31, 2016
Statement Of Financial Position [Abstract]    
Common shares, par value $ 0.001 $ 0.001
Common shares, shares authorized 1,000.0 1,000.0
Common shares, shares outstanding 89.3 93.1
Treasury stock shares, at cost 4.6