Stock Repurchase (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021	May 31, 2023
Common stock authorized for repurchase, maximum	$ 250.0			$ 250.0
Common stock remaining number of shares authorized to repurchase	90.9
Stock repurchased (shares)	10.6
Stock repurchased during period (value)	$ 289.1
Weighted average price per share of common stock (in dollars per share)	$ 27.30
Excise tax related to the stock repurchases as treasury stock	$ 2.9
Payment of income tax obligation on employee equity awards	0.6	$ 1.2	$ 1.6
February 2019 Stock Repurchase Program
Stock repurchased during period (value)	130.0
May 2023 Stock Repurchase Program
Stock repurchased during period (value)	$ 159.1