Earnings Per Share (Schedule of Earnings Per Share) (Detail) - USD ($) $ / shares in Units, shares in Millions, $ in Millions		12 Months Ended
		Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Earnings Per Share [Line Items]
Net Income (Loss)		$ 131.1	$ 216.8	$ 263.0
Basic weighted-average shares		103.9	104.3	107.0
Diluted weighted-average shares		104.3	104.6	107.3
Basic		$ 1.26	$ 2.08	$ 2.46
Diluted		$ 1.26	$ 2.07	$ 2.45
RSUs
Earnings Per Share [Line Items]
Effect of dilutive RSUs	[1]	0.4	0.3	0.3

[1] Includes 79 and 32 thousand dilutive PRSUs for the years ended December 31, 2024 and 2023, respectively.