Shareholders' Equity (Shares Repurchased Under Stock Repurchase Program) (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions		1 Months Ended	3 Months Ended
		Apr. 24, 2024	Mar. 31, 2024	Mar. 31, 2023
Class of Stock [Line Items]
Aggregate purchase price			$ 38.8	$ 307.5
Excise tax accrual on share repurchases			$ 0.1	$ 2.5
Stock Repurchase Program Board Authorized Repurchases
Class of Stock [Line Items]
Shares repurchased (in shares)			0.2	2.4
Aggregate purchase price	[1]		$ 38.7	$ 305.0
Average purchase price per share (in dollars per share)			$ 158.40	$ 126.37
Remaining amount available for share repurchase			$ 282.1
Stock Repurchase Program Board Authorized Repurchases | Subsequent Event
Class of Stock [Line Items]
Shares repurchased (in shares)		1.4
Aggregate purchase price		$ 211.3
Average purchase price per share (in dollars per share)		$ 155.74
Increase in share repurchase authorization		$ 1,000.0

[1] (1) Excludes excise taxes imposed under the Inflation Reduction Act of $0.1 million and $2.5 million for the three months ended March 31, 2024, and March 31, 2023, respectively.