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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, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2018	Mar. 31, 2017	Mar. 31, 2016
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues		$ 1,040.2	$ 1,142.7	$ 940.8	$ 1,005.3	$ 1,256.1	$ 752.3	$ 639.5	$ 553.6	$ 4,129.1	$ 3,201.5	$ 2,347.4
Long-Lived Assets	[1]	1,859.1				1,904.0				1,859.1	1,904.0
Canada
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues										48.3	56.0	55.1
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										3,383.0	2,431.9	1,550.2
Long-Lived Assets	[1]	1,824.5				1,870.8				1,824.5	1,870.8
Other Foreign
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues										697.8	713.6	$ 742.1
Long-Lived Assets	[1]	$ 34.6				$ 33.2				$ 34.6	$ 33.2
[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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- Definition

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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 41
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=68060357&loc=d3e9038-108599

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Total revenue from sale of goods and services rendered during the reporting period, in the normal course of business, reduced by sales returns and allowances, and sales discounts.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.1)
-URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688

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