Business Segment Information (Details) $ in Millions	3 Months Ended	9 Months Ended
Sep. 30, 2018 USD ($)	Sep. 30, 2017 USD ($)	Sep. 30, 2018 USD ($) segment	Sep. 30, 2017 USD ($)	Dec. 31, 2017 USD ($)
Business segment information
Number of reportable segments \| segment			2
Revenue	$ 466.6	$ 435.6	$ 1,342.0	$ 1,235.4
Operating Income (loss)	69.1	51.3	156.0	124.2
Assets	1,889.1		1,889.1		$ 1,948.5
Eliminations
Business segment information
Revenue	(1.4)	(1.1)	(3.7)	(4.3)
Corporate, eliminations and other
Business segment information
Operating Income (loss)	0.1	5.0	0.2	5.0
Assets	(3.2)		(3.2)		(4.9)
BSI \| Operating segments
Business segment information
Revenue	417.1	390.6	1,206.5	1,099.5
Operating Income (loss)	63.6	44.5	146.5	114.9
Assets	1,854.5		1,854.5		1,917.8
BEST \| Operating segments
Business segment information
Revenue	50.9	46.1	139.2	140.2
Operating Income (loss)	5.4	$ 1.8	9.3	$ 4.3
Assets	$ 37.8		$ 37.8		$ 35.6

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)
-URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688

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