CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Millions |
Mar. 31, 2020 |
Dec. 31, 2019 |
|---|---|---|
| Statement of Financial Position [Abstract] | ||
| Trade accounts receivable, allowance for doubtful accounts | $ 13.4 | $ 11.2 |
| Preferred stock, par value (in dollars per share) | $ 0.01 | $ 0.01 |
| Preferred stock, Authorized shares (in shares) | 10,000,000.0 | 10,000,000.0 |
| Preferred stock, Issued shares (in shares) | 0 | 0 |
| Common stock, par value (in dollars per share) | $ 1.25 | $ 1.25 |
| Common stock, Authorized shares (in shares) | 300,000,000.0 | 300,000,000.0 |
| Common stock, Issued shares (in shares) | 189,300,000 | 189,300,000 |
| Common stock, Outstanding shares (in shares) | 121,400,000 | 121,200,000 |
| Treasury stock, shares (in shares) | 67,300,000 | 67,500,000 |
| Stock held by employee benefits trusts, shares (in shares) | 600,000 | 600,000 |