Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Millions	Dec. 31, 2016	Dec. 31, 2015
Accounts receivable, allowances	$ 7.2	$ 7.5
Preferred stock, par value	$ 1.0	$ 1.0
Preferred stock, authorized	5,000,000	5,000,000
Preferred stock, issued	0	0
Common stock, par value	$ 0.25	$ 0.25
Common stock, authorized	600,000,000	600,000,000
Common stock, issued	72,899,251	73,697,371
Common stock, outstanding	72,899,251	73,697,371