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Segment Information (Revenue and Long-Lived Assets by Geographic Location) (Details) - USD ($) $ in Millions		3 Months Ended								12 Months Ended
		Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2019	Mar. 31, 2018	Mar. 31, 2017
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues		$ 913.7	$ 933.2	$ 901.0	$ 932.7	$ 1,040.2	$ 1,142.7	$ 940.8	$ 1,005.3	$ 3,680.5	$ 4,129.1	$ 3,201.5
Long-Lived Assets	[1]	1,831.1				1,859.1				1,831.1	1,859.1
Canada
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues										47.9	48.3	56.0
Long-Lived Assets	[1]	0.0				0.0				0.0	0.0
United States
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues										3,124.6	3,383.0	2,431.9
Long-Lived Assets	[1]	1,737.8				1,824.5				1,737.8	1,824.5
Other Foreign
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues										508.0	697.8	$ 713.6
Long-Lived Assets	[1]	$ 93.3				$ 34.6				$ 93.3	$ 34.6
[1] Long-lived assets represents total assets less the following: current assets, investments, long-term receivables, intangible assets, goodwill and deferred tax assets.

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Long-lived assets other than financial instruments, long-term customer relationships of a financial institution, mortgage and other servicing rights, deferred policy acquisition costs, and deferred tax assets.

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