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Shareholders' Equity (Shares Repurchased Under Share Repurchase Program) (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	1 Months Ended	3 Months Ended				6 Months Ended
	Apr. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Jun. 30, 2020	Mar. 31, 2020	Jun. 30, 2021	Jun. 30, 2020	Jul. 15, 2021
Class of Stock [Line Items]
Aggregate purchase price		$ 736.1	$ 306.1		$ 80.0
Shares of treasury stock retired	16.0
Stock Repurchase Program Board Authorized Repurchases [Member]
Class of Stock [Line Items]
Shares repurchased (in shares)		7.5		0.0		11.3	2.5
Aggregate purchase price		$ 736.1		$ 0.0		$ 1,042.2	$ 80.0
Average purchase price per share (in dollars per share)		$ 98.17		$ 0		$ 91.94	$ 31.95
Remaining amount available for share repurchase		$ 155.5				$ 155.5
Stock Repurchase Program Board Authorized Repurchases [Member] | Subsequent Event [Member]
Class of Stock [Line Items]
Stock Repurchase Program, Authorized Amount								$ 1,000.0

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Amount of stock repurchase plan authorized.

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

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