Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Millions	Dec. 31, 2016	Dec. 31, 2015
Statement of Financial Position [Abstract]
Accounts Receivable, allowances (in dollars)	$ 11.1	$ 12.8
Preferred stock, shares authorized (in shares)	3,500,000	3,500,000
Preferred stock, par value (in dollars per share)	$ 0.01	$ 0.01
Preferred stock, shares outstanding (in shares)	0	0
Common stock, shares authorized (in shares)	300,000,000	300,000,000
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, shares issued (in shares)	163,175,928	163,175,928
Common stock, shares outstanding (in shares)	139,841,214	136,617,161
Treasury stock, shares (in shares)	23,334,714	26,558,767