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Business Segment Information - Information by Segment (Details) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2017 USD ($)	Sep. 30, 2017 USD ($)	Jun. 30, 2017 USD ($)	Mar. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)	Sep. 30, 2016 USD ($)	Jun. 30, 2016 USD ($)	Mar. 31, 2016 USD ($)	Dec. 31, 2017 USD ($) segment	Dec. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)
Business segment information
Number of reportable segments \| segment									2
Revenue	$ 530.5	$ 435.6	$ 414.9	$ 384.9	$ 470.3	$ 393.9	$ 371.7	$ 375.4	$ 1,765.9	$ 1,611.3	$ 1,623.8
Operating income	93.7	$ 49.9	$ 33.5	37.6	76.9	$ 45.9	20.4	$ 34.0	214.7	177.2	145.7
Impairment of assets	0.8			$ 0.3	0.1		$ 0.7		1.1	0.8	4.6
Assets	1,948.5				1,808.4				1,948.5	1,808.4
Capital Expenditures									43.7	37.1	34.2
Depreciation and amortization									63.9	54.3	53.3
Eliminations
Business segment information
Revenue									(9.2)	(11.5)	(9.1)
Corporate, eliminations and other
Business segment information
Operating income									(1.3)	1.7	1.0
Assets	(4.9)				(7.4)				(4.9)	(7.4)
BSI
Business segment information
Capital Expenditures									38.5	34.6	30.1
Depreciation and amortization									59.8	51.3	50.5
BSI \| Operating segments
Business segment information
Revenue									1,583.9	1,492.6	1,499.2
Operating income									208.6	168.9	133.2
Assets	1,917.8				1,779.8				1,917.8	1,779.8
BEST
Business segment information
Capital Expenditures									5.2	2.5	4.1
Depreciation and amortization									4.1	3.0	2.8
BEST \| Operating segments
Business segment information
Revenue									191.2	130.2	133.7
Operating income									7.4	6.6	$ 11.5
Assets	$ 35.6				$ 36.0				$ 35.6	$ 36.0