Business Segment Information (Details) $ in Millions	3 Months Ended	6 Months Ended
Jun. 30, 2018 USD ($)	Jun. 30, 2017 USD ($)	Jun. 30, 2018 USD ($) segment	Jun. 30, 2017 USD ($)	Dec. 31, 2017 USD ($)
Business segment information
Number of reportable segments \| segment			2
Revenue	$ 443.7	$ 414.9	$ 875.4	$ 799.8
Operating Income (loss)	48.8	35.3	86.9	72.9
Assets	1,806.0		1,806.0		$ 1,948.5
Eliminations
Business segment information
Revenue	(1.4)	(1.6)	(2.3)	(3.2)
Corporate, eliminations and other
Business segment information
Operating Income (loss)	(0.1)		0.1
Assets	(3.7)		(3.7)		(4.9)
BSI \| Operating segments
Business segment information
Revenue	402.4	362.5	789.4	708.9
Operating Income (loss)	47.2	32.3	82.9	70.4
Assets	1,769.4		1,769.4		1,917.8
BEST \| Operating segments
Business segment information
Revenue	42.7	54.0	88.3	94.1
Operating Income (loss)	1.7	$ 3.0	3.9	$ 2.5
Assets	$ 40.3		$ 40.3		$ 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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