Business Segment Information (Details) $ in Millions	3 Months Ended	9 Months Ended
Sep. 30, 2017 USD ($)	Sep. 30, 2016 USD ($)	Sep. 30, 2017 USD ($) segment	Sep. 30, 2016 USD ($)	Dec. 31, 2016 USD ($)
Business segment information
Number of reportable segments \| segment			2
Revenue	$ 435.6	$ 393.9	$ 1,235.4	$ 1,141.0
Operating income	49.9	45.9	121.0	100.3
Assets	1,961.5		1,961.5		$ 1,808.4
Eliminations
Business segment information
Revenue	(1.1)	(3.1)	(4.3)	(7.8)
Corporate, eliminations and other
Business segment information
Operating income	5.0	(0.1)	5.0	0.9
Assets	(2.0)		(2.0)		(7.4)
BSI \| Operating segments
Business segment information
Revenue	390.6	361.5	1,099.5	1,057.6
Operating income	43.1	43.3	111.7	95.3
Assets	1,929.4		1,929.4		1,779.8
BEST \| Operating segments
Business segment information
Revenue	46.1	35.5	140.2	91.2
Operating income	1.8	$ 2.7	4.3	$ 4.1
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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