Business Segment Information (Details) $ in Millions	3 Months Ended	6 Months Ended
Jun. 30, 2017 USD ($)	Jun. 30, 2016 USD ($)	Jun. 30, 2017 USD ($) segment	Jun. 30, 2016 USD ($)	Dec. 31, 2016 USD ($)
Business segment information
Number of reportable segments \| segment			2
Revenue	$ 414.9	$ 371.7	$ 799.8	$ 747.1
Operating income	33.5	20.4	71.1	54.4
Assets	1,912.9		1,912.9		$ 1,808.4
Eliminations
Business segment information
Revenue	(1.6)	(2.5)	(3.2)	(4.7)
Corporate, eliminations and other
Business segment information
Operating income		0.1		1.1
Assets	(3.5)		(3.5)		(7.4)
BSI \| Operating segments
Business segment information
Revenue	362.5	345.7	708.9	696.1
Operating income	30.5	18.9	68.6	51.9
Assets	1,882.3		1,882.3		1,779.8
BEST \| Operating segments
Business segment information
Revenue	54.0	28.5	94.1	55.7
Operating income	3.0	$ 1.4	2.5	$ 1.4
Assets	$ 34.1		$ 34.1		$ 36.0

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
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(a)(12))
-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(11))
-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

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+ 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)
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