Condensed Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Millions	Jun. 30, 2020	Dec. 31, 2019
Statement of Financial Position [Abstract]
Allowance for doubtful accounts	$ 2.0	$ 1.0
Common Stock, Par or Stated Value Per Share	$ 1	$ 1
Common Stock, Shares Authorized	200,000,000	200,000,000
Common Stock, Shares, Issued	129,665,899	129,665,899
Common Stock, Shares, Outstanding	112,170,565	111,945,021
Treasury Stock, Shares	17,495,334	17,720,878