Derivatives and Hedging (Details) - USD ($) $ in Millions		12 Months Ended
	Jan. 18, 2022	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020	Jul. 31, 2016	Jul. 31, 2015
Derivative fair values
Other comprehensive income		$ 3.9	$ 0.2	$ 2.8
Tax impact		(0.9)	(1.3)	(0.9)
Stockholders' equity		$ 40.2	(21.6)	(17.6)	$ 384.4
5.125% Senior Notes Due August 1, 2031 | Senior notes
Derivative fair values
Repayments of debt	$ 125.0
Interest rate	5.125%	5.125%
Amortization expense			1.3
Interest Expense
Derivative fair values
Gain (loss) reclassified from AOCI to interest expense		$ 3.4	4.6	3.3
Amount reclassified within twelve months		3.6
Accumulated other comprehensive income
Derivative fair values
Other comprehensive income		2.5	3.3	2.4
Tax impact		(0.9)	(1.3)	(0.9)
Stockholders' equity		(9.8)	$ (12.3)	$ (15.6)	$ (18.0)
Treasury rate lock | Accumulated other comprehensive income
Derivative fair values
Stockholders' equity		$ (9.8)
Treasury rate lock | Designated as a hedge
Derivative fair values
Notional amount							$ 300.0
Fair value of derivative						$ (34.4)