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Condensed Consolidated Balance Sheets (Parenthetical) - USD ($)
$ in Millions
Jun. 30, 2017
Dec. 31, 2016
Statement of Financial Position [Abstract]    
Allowance for doubtful accounts receivable, current $ 1.0 $ 0.8
Accumulated depreciation, properties and equipment 106.7 101.3
Accumulated depreciation, rental equipment 15.2 9.7
Accumulated amortization, intangible assets $ 1.3 $ 0.5
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) 65,900,000 65,400,000
Treasury stock, shares (shares) 6,000,000 5,800,000