Loss from discontinued operations (Details) - USD ($) $ in Millions	1 Months Ended		3 Months Ended			6 Months Ended
	Nov. 30, 2015	Feb. 28, 2015	Jun. 30, 2016	Dec. 31, 2015	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Gain (loss) from operations			$ 0.0		$ 0.0	$ 0.0	$ (2.4)
Loss on sale			0.0		(0.1)	0.0	(0.8)
Adjustments to contingencies of former operations			0.1		0.0	0.1	(0.1)
(Income) loss from discontinued operations before income taxes			0.1		(0.1)	0.1	(3.3)
Provision (benefit) for income taxes			0.1		(0.2)	0.1	(1.0)
(Income) loss from discontinued operations, net of tax			$ 0.0		$ 0.1	$ 0.0	$ (2.3)
Mexican Parcel Services | Pension settlement charges
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Gain (loss) from operations		$ (1.0)
Russia
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Ownership percent	70.00%
Gain (loss) on disposition				$ (5.9)
Reclassification of foreign currency				$ 5.0