Temporary Equity, Stockholders' Equity and Dividends (Narrative) (Details) - USD ($) $ / shares in Units, $ in Millions			2 Months Ended	3 Months Ended											12 Months Ended
	Feb. 01, 2023	Jan. 03, 2023	Feb. 25, 2026	Dec. 31, 2025	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, 2023	Jun. 30, 2023	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023	Jan. 31, 2026
Dividends Payable [Line Items]
Dividends															$ 34.8	$ 34.2	$ 31.6
Redeemable non-controlling interest, redemption period															60 days
Adjustment of redeemable noncontrolling interest															$ 5.3	0.0	0.0
Dividend per share (usd per share)				$ 0.31	$ 0.31	$ 0.29	$ 0.29	$ 0.29	$ 0.29	$ 0.27	$ 0.27	$ 0.27	$ 0.27	$ 0.27
Subsequent Event
Dividends Payable [Line Items]
Dividend per share (usd per share)			$ 0.31
VeriTread
Dividends Payable [Line Items]
Non-controlling interest, percentage		4.00%
VeriTread | Subsequent Event
Dividends Payable [Line Items]
Equity interest percentage, parent																		100.00%
VeriTread
Dividends Payable [Line Items]
Remaining units ownership interest, percentage		21.00%
Series A Senior Preferred Shares
Dividends Payable [Line Items]
Dividends															8.1	7.5	7.3
Preferred Dividends on Series A Senior Preferred Shares
Dividends Payable [Line Items]
Dividends															$ 26.7	$ 26.7	$ 24.3
Securities Purchase Agreement
Dividends Payable [Line Items]
Initial conversion price (usd per share)	$ 73.00			$ 71.58											$ 71.58
Securities Purchase Agreement | Starboard Value LP and certain of its affiliates | Series A Senior Preferred Shares
Dividends Payable [Line Items]
Initial preferred dividend, percentage	5.50%
Participating dividends (usd per share)	$ 0.27
Increase in preferred dividend rate in fourth anniversary, percentage	7.50%
Spread on variable rate, percentage	6.00%
Increase in preferred dividend rate in ninth anniversary, percentage	10.50%