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Condensed Consolidated Balance Sheets (Parenthetical) - USD ($)
$ in Millions
Jun. 30, 2016
Dec. 31, 2015
Statement of Financial Position [Abstract]    
Allowance for doubtful accounts $ 1.1 $ 0.8
Accumulated depreciation, properties and equipment 102.6 100.2
Accumulated depreciation, rental equipment 4.2 2.6
Accumulated depreciation, intangible assets $ 0.4 $ 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) 65,300,000 64,800,000
Treasury stock, shares (shares) 5,400,000 2,600,000