Unaudited condensed consolidated balance sheets (Parenthetical) - USD ($) shares in Thousands, $ in Millions	Mar. 31, 2026	Dec. 31, 2025
Statement of Financial Position [Abstract]
Accounts receivable, net of allowances of $26.4 and $29.6	$ 26.4	$ 29.6
Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment	$ 765.5	$ 744.7
Common stock, shares, issued (in shares)	682,900	682,000
Common stock, shares, outstanding (in shares)	682,900	682,000
Common stock, shares, authorized (in shares)	750,000	750,000
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Treasury stock (in shares)	6,600