Treasury Stock Transactions (Details) - USD ($) shares in Millions, $ in Millions		3 Months Ended		9 Months Ended
		Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Equity, Class of Treasury Stock [Line Items]
Cost of Shares Repurchased	[1]	$ 74.8	$ 42.6	$ 175.4	$ 137.5
Number of Treasury Shares Repurchased		1.5	1.2	3.9	4.2
Commissions Paid on Stock Repurchases				$ 0.1	$ 0.1
Share Repurchases Excise Tax		0.7	0.0	1.2	0.0
Accelerated Share Repurchase Agreement [Member]
Equity, Class of Treasury Stock [Line Items]
Cost of Shares Repurchased		$ 50.0	$ 50.0	$ 50.0	$ 50.0
Number of Treasury Shares Repurchased		1.0	1.7	1.0	1.7

[1] 1Includes a de minimis amount and $0.1 million of commissions for the three and nine months ended September 30, 2023, respectively, and a de minimis amount and $0.1 million of commissions for the three and nine months ended September 30, 2022, respectively. There was $0.7 million and $1.2 million of excise tax for the three and nine months ended September 30, 2023, respectively. There were no excise taxes during the three and nine months ended September 30, 2022.