Share Repurchases (Details) - USD ($) $ / shares in Units, $ in Millions	12 Months Ended			60 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2023	Dec. 31, 2018
Equity, Class of Treasury Stock [Line Items]
Shares repurchased (in shares)	2,300,000	2,600,000	0	6,700,000
Value of shares repurchased	$ 192.1	$ 150.0		$ 427.1
Treasury stock acquired, average cost per share (in usd per share)	$ 85.27	$ 57.95		$ 63.67
Stock repurchase program, remaining authorized repurchase amount	$ 172.9			$ 172.9
2018 Share Repurchase Program
Equity, Class of Treasury Stock [Line Items]
Stock repurchase program, authorized amount					$ 300.0
2023 Share Repurchase Program
Equity, Class of Treasury Stock [Line Items]
Stock repurchase program, authorized amount	$ 300.0			$ 300.0