Goodwill and Other Intangibles (Goodwill by Reporting Segment) (Details) $ in Millions	6 Months Ended
	Jun. 30, 2022 USD ($)
Goodwill [Roll Forward]
Goodwill, Beginning Balance	$ 706.2
Foreign Exchange Rates	(16.2)
Goodwill, Ending Balance	690.0
ASSET SERVICING
Goodwill [Roll Forward]
Goodwill, Beginning Balance	625.7
Foreign Exchange Rates	(16.0)
Goodwill, Ending Balance	609.7
WEALTH MANAGEMENT
Goodwill [Roll Forward]
Goodwill, Beginning Balance	80.5
Foreign Exchange Rates	(0.2)
Goodwill, Ending Balance	$ 80.3