Balance Sheet Parenthetical (Parentheticals) - USD ($) shares in Millions, $ in Millions	Dec. 31, 2015	Dec. 31, 2014
Allowance for Doubtful Accounts Receivable, Current	$ 3.4	$ 5.3
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	190.8	190.4
Common Stock, Shares, Outstanding	96.5	96.8
Treasury Stock, Shares	94.4	93.5