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Equity and Dividends (Narrative) (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions		1 Months Ended			3 Months Ended								9 Months Ended
	Nov. 05, 2025	Jun. 30, 2025	Mar. 31, 2025	Aug. 31, 2024	Sep. 30, 2025	Jun. 30, 2025	Mar. 31, 2025	Dec. 31, 2024	Sep. 30, 2024	Jun. 30, 2024	Mar. 31, 2024	Dec. 31, 2023	Sep. 30, 2025	Sep. 30, 2024
Dividends Payable [Line Items]
Sale of stock, aggregate shares (in shares)				2.8			1.0
Sale of stock, exercise price (in dollars per share)			$ 68.21	$ 68.40			$ 68.21
Sale of stock, available shares (in shares)							65.5
At-the market shelf registration, equity offering sales agreement, aggregate sales price					$ 500.0								$ 500.0
Sale of stock, price per share (in dollars per share)					$ 70.47								$ 70.47
Stock issued during period, remaining shares (in shares)													1.3
Proceeds from sale of treasury stock													$ 90.6
Dividends to common stockholders (in dollars per share)					$ 0.92	$ 0.90	$ 0.90	$ 0.90	$ 0.90	$ 0.90	$ 0.90	$ 0.90	$ 2.72	$ 2.70
Subsequent Event
Dividends Payable [Line Items]
Dividends to common stockholders (in dollars per share)	$ 0.92
At The Market
Dividends Payable [Line Items]
Sale of stock, additional purchase of shares (in shares)			0.2
Sale of stock, price per share (in dollars per share)			$ 74.39				$ 74.39
Sale of stock, consideration received			$ 15.5
Issuance of common stock (in shares)					0.0								0.0
At The Market, December 2024 and March 2025
Dividends Payable [Line Items]
Sale of stock, price per share (in dollars per share)		$ 74.71			$ 73.96	$ 74.71							$ 73.96
Stock issued during period, remaining shares (in shares)					0.2	0.8
Proceeds from sale of treasury stock					$ 11.4	$ 58.0
At The Market, Matures in Q2 2026
Dividends Payable [Line Items]
Sale of stock, additional purchase of shares (in shares)		1.3
Sale of stock, price per share (in dollars per share)		$ 71.41				$ 71.41
Sale of stock, consideration received		$ 91.8

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