Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

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-Section S99

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Reference 2: http://www.xbrl.org/2003/role/presentationRef

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Reference 3: http://www.xbrl.org/2003/role/presentationRef

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Reference 4: http://www.xbrl.org/2003/role/presentationRef

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- Definition

Number of segments reported by the entity. A reportable segment is a component of an entity for which there is an accounting requirement to report separate financial information on that component in the entity's financial statements.

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The net result for the period of deducting operating expenses from operating revenues.

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Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

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-Section S99

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Business Segment Information (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2015 segment	Mar. 31, 2014	Dec. 31, 2014
Business segment information
Number of reporting segments	2us-gaap_NumberOfReportableSegments
Revenue:
Total revenue	$ 353.5us-gaap_Revenues	$ 423.7us-gaap_Revenues
Operating Income:
Total operating income	15.2us-gaap_OperatingIncomeLoss	20.6us-gaap_OperatingIncomeLoss
Assets:
Total assets	1,772.7us-gaap_Assets		1,864.8us-gaap_Assets
Eliminations
Revenue:
Total revenue	(1.5)	(5.0)
Corporate, eliminations and other
Operating Income:
Total operating income	0.5	1.2
Assets:
Total assets	(60.0)		(64.1)
BSI \| Operating segments
Revenue:
Total revenue	327.5	393.9
Operating Income:
Total operating income	13.7	16.6
Assets:
Total assets	1,744.2		1,827.7
BEST \| Operating segments
Revenue:
Total revenue	27.5	34.8
Operating Income:
Total operating income	1.0	2.8
Assets:
Total assets	$ 88.5		$ 101.2