Condensed Consolidated Balance Sheets (Unaudited) (Parenthetical) - USD ($) $ in Millions	Mar. 31, 2024	Dec. 31, 2023
Statement of Financial Position [Abstract]
Allowance	$ 31.2	$ 30.4
Accumulated depreciation and amortization	(1,651.2)	(1,620.1)
Accumulated amortization	$ (289.6)	$ (278.7)
Par value (in dollars per share)	$ 1	$ 1
Shares authorized (in shares)	100,000,000.0	100,000,000.0
Shares issued (in shares)	44,600,000	44,500,000
Shares outstanding (in shares)	44,600,000	44,500,000