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Shareholders' Equity (Shares Repurchased Under Stock Repurchase Program) (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended						6 Months Ended
	Jun. 30, 2023		Mar. 31, 2023	Jun. 30, 2022		Mar. 31, 2022	Jun. 30, 2023	Jun. 30, 2022
Class of Stock [Line Items]
Aggregate purchase price	$ 209.5		$ 307.5	$ 403.9		$ 380.9
Excise tax accrual on share repurchases	$ 2.1						$ 4.6
Stock Repurchase Program Board Authorized Repurchases
Class of Stock [Line Items]
Shares repurchased (in shares)	1.6			3.7			4.0	7.2
Aggregate purchase price	$ 207.4	[1]		$ 403.9	[1]		$ 512.4	$ 784.9
Average purchase price per share (in dollars per share)	$ 132.44			$ 109.22			$ 128.76	$ 109.62
Remaining amount available for share repurchase	$ 672.0						$ 672.0
[1] (1) Excludes excise tax accrual imposed under the Inflation Reduction Act of $2.1 million and $4.6 million for the three and six months ended June 30, 2023, respectively.

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Excise taxes imposed on share repurchases under the Inflation Reduction Act.

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Total cost of shares repurchased divided by the total number of shares repurchased.

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