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Changes in Carrying Amount of Goodwill and Trade Names (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Goodwill [Line Items]
Goodwill, Acquired During Period	$ 7.1
Finite-Lived Intangible Assets, Gross	1.9	$ 0.6
Finite-Lived Intangible Assets, Accumulated Amortization	(0.5)	(0.4)
Intangible Assets, Gross (Excluding Goodwill)	10.7	0.6
Intangible Assets, Net (Excluding Goodwill)	10.2	0.2
Finite-Lived Intangible Assets, Net	1.4	0.2
Indefinite-Lived Intangible Assets (Excluding Goodwill)	8.8	0.0
Finite-Lived Intangible Assets, Aggregate Amortization Expense, Future Periods	$ 0.2
Customer Relationships and Other Intangibles [Member]
Goodwill [Line Items]
Finite-Lived Intangible Asset, Useful Life	10 years
Other Intangible Assets [Member]
Goodwill [Line Items]
Finite-Lived Intangible Assets, Gross	$ 1.1	0.6
Finite-Lived Intangible Assets, Accumulated Amortization	(0.4)	(0.4)
Finite-Lived Intangible Assets, Net	0.7	0.2
Customer Relationships [Member]
Goodwill [Line Items]
Finite-Lived Intangible Assets, Gross	0.8	0.0
Finite-Lived Intangible Assets, Accumulated Amortization	(0.1)	0.0
Finite-Lived Intangible Assets, Net	0.7	0.0
Trade Names [Member]
Goodwill [Line Items]
Indefinite-Lived Intangible Assets (Excluding Goodwill)	$ 8.8	$ 0.0

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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 30
-Section 50
-Paragraph 2
-Subparagraph (a)(1)
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