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Consolidated Balance Sheets Consolidated Balance Sheets (Parentheticals) - USD ($)
shares in Thousands, $ in Millions
Mar. 31, 2020
Dec. 31, 2019
Consolidated Balance Sheets Parentheticals [Abstract]    
Accounts Receivable, Allowance for Credit Loss, Current $ 1.1 $ 1.1
Preferred Stock, Par or Stated Value Per Share $ 0.01 $ 0.01
Preferred Stock, Shares Authorized 5,000 5,000
Preferred Stock, Shares Issued 0 0
Common Stock, Par or Stated Value Per Share $ 0.01 $ 0.01
Common Stock, Shares Authorized 395,000 395,000
Common Stock, Shares, Issued 90,689 90,689
Common Stock, Shares, Outstanding 81,345 82,028
Treasury Stock, Shares 9,344 8,661