Condensed Consolidated Balance Sheets (Unaudited) (Parenthetical) - USD ($) $ in Millions	Sep. 30, 2024	Dec. 31, 2023
Statement of Financial Position [Abstract]
Allowance	$ 28.8	$ 30.4
Accumulated depreciation and amortization	(1,690.6)	(1,620.1)
Accumulated amortization	$ (318.7)	$ (278.7)
Par value (in dollars per share)	$ 1	$ 1
Shares authorized (in shares)	100,000,000	100,000,000.0
Shares issued (in shares)	43,700,000	44,500,000
Shares outstanding (in shares)	43,700,000	44,500,000