Goodwill and Other Intangibles (Goodwill by Reporting Segment) (Details) $ in Millions	9 Months Ended
	Sep. 30, 2022 USD ($)
Goodwill [Roll Forward]
Goodwill, Beginning Balance	$ 706.2
Foreign Exchange Rates	(27.2)
Goodwill, Ending Balance	679.0
ASSET SERVICING
Goodwill [Roll Forward]
Goodwill, Beginning Balance	625.7
Foreign Exchange Rates	(26.9)
Goodwill, Ending Balance	598.8
WEALTH MANAGEMENT
Goodwill [Roll Forward]
Goodwill, Beginning Balance	80.5
Foreign Exchange Rates	(0.3)
Goodwill, Ending Balance	$ 80.2