Goodwill and Other Intangibles (Narrative) (Details) - USD ($) $ in Millions		3 Months Ended
	Feb. 19, 2017	Mar. 31, 2017	Mar. 31, 2016	Dec. 31, 2016
Acquired Finite-Lived Intangible Assets [Line Items]
Net Book Value		$ 41.1		$ 41.8
Other Intangible Assets
Acquired Finite-Lived Intangible Assets [Line Items]
Amortization expense related to other intangible assets		2.4	$ 2.1
Estimated future amortization expense for 2017		6.7
Estimated future amortization expense for 2018		8.3
Estimated future amortization expense for 2019		8.2
Estimated future amortization expense for 2020		8.2
Estimated future amortization expense for 2021		$ 5.9
UBS Asset Management Fund Administration Servicing Business
Acquired Finite-Lived Intangible Assets [Line Items]
Cash paid	$ 175.0