Balance Sheet Parenthetical (Parentheticals) - USD ($) shares in Millions, $ in Millions	Dec. 31, 2015	Dec. 31, 2014
Allowance for Doubtful Accounts Receivable, Current	$ 5.3	$ 8.1
Preferred Stock, Value, Issued	$ 0.0	$ 0.0
Preferred Stock, Shares Authorized	5.0	5.0
Preferred Stock, Shares Outstanding	0.0	0.0
Common Stock, Par or Stated Value Per Share	$ 0.0	$ 0.0
Common Stock, Shares Authorized	500.0	500.0
Common Stock, Shares, Issued	190.4	189.8
Common Stock, Shares, Outstanding	96.8	99.4
Treasury Stock, Shares	93.5	90.4