Consolidated Statement of Changes in Stockholders' Equity - USD ($) $ in Millions	Total	Common stock	Retained earnings	Accumulated other comprehensive loss
Equity, beginning balance at Dec. 31, 2024	$ 3,304.0	$ 2,459.5	$ 1,166.4	$ (321.9)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	50.2	0.0	50.2	0.0
Other comprehensive income (loss), net of tax expense	$ 54.4	0.0	0.0	54.4
Stock repurchased and retired (in shares)	106,630
Non-vested common shares issued (in shares)	480,289
Stock Issued During Period, Shares, Restricted Stock Award, Forfeited	49,862
Common stock transactions:
Common shares purchased and retired	$ (3.2)	(3.2)	0.0	0.0
Non-vested common shares issued	0.0	0.0	0.0	0.0
Non-vested common shares forfeited or canceled	0.0	0.0	0.0	0.0
Stock-based compensation expense	$ 3.9	3.9	0.0	0.0
Common dividends (in dollars per share)	$ 0.47
Common cash dividend declared	$ (48.0)	0.0	(48.0)	0.0
Equity, ending balance at Mar. 31, 2025	3,361.3	2,460.2	1,168.6	(267.5)
Equity, beginning balance at Dec. 31, 2025	3,447.0	2,350.9	1,274.2	(178.1)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	60.2	0.0	60.2	0.0
Other comprehensive income (loss), net of tax expense	$ (17.6)	0.0	0.0	(17.6)
Stock repurchased and retired (in shares)	2,477,093
Non-vested common shares issued (in shares)	334,211
Stock Issued During Period, Shares, Restricted Stock Award, Forfeited	142,773
Common stock transactions:
Common shares purchased and retired	$ (87.7)	(87.7)	0.0	0.0
Non-vested common shares issued	0.0	0.0	0.0	0.0
Non-vested common shares forfeited or canceled	0.0	0.0	0.0	0.0
Stock-based compensation expense	$ 2.3	2.3	0.0	0.0
Common dividends (in dollars per share)	$ 0.47
Common cash dividend declared	$ (45.7)	0.0	(45.7)	0.0
Equity, ending balance at Mar. 31, 2026	$ 3,358.5	$ 2,265.5	$ 1,288.7	$ (195.7)