Consolidated (Condensed) Balance Sheets (Parenthetical) - USD ($) $ in Millions	Mar. 31, 2017	Dec. 31, 2016
Statement of Financial Position [Abstract]
Accounts receivable allowances	$ 4.2	$ 5.3
Common stock shares authorized (in shares)	300,000,000	300,000,000
Common stock shares issued (in shares)	138,918,189	138,601,327
Common stock shares outstanding (in shares)	138,878,878	138,562,016