Consolidated Balance Sheets Parenthetical (Parentheticals) - USD ($) shares in Millions, $ in Millions	Sep. 30, 2015	Dec. 31, 2014
Statement of Financial Position [Abstract]
Allowance for doubtful accounts	$ 7.0	$ 5.7
Preferred shares, par value	$ 0.01	$ 0.01
Preferred shares, authorized	100.0	100.0
Preferred shares, issued	0.0	0.0
Preferred shares, outstanding	0.0	0.0
Common shares, par value	$ 0.01	$ 0.01
Common shares, shares authorized	1,000.0	1,000.0
Common shares, shares issued	169.2	172.2
Common shares, shares outstanding	169.2	172.2