Condensed Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Millions	Sep. 30, 2016	Dec. 31, 2015
Statement of Financial Position [Abstract]
Allowance for Doubtful Accounts Receivable, Current	$ 1.3	$ 0.8
Accumulated depreciation, properties and equipment	104.1	100.2
Accumulated depreciation, rental equipment	6.8	2.6
Accumulated depreciation, intangible assets	$ 0.5	$ 0.4
Common stock, par value (usd per share)	$ 1	$ 1
Common stock, shares authorized (shares)	90,000,000	90,000,000
Common stock, shares issued (shares)	65,400,000	64,800,000
Treasury stock, shares (shares)	5,500,000	2,600,000