Loss from discontinued operations (Details) - USD ($) $ in Millions	1 Months Ended		3 Months Ended
	Nov. 30, 2015	Feb. 28, 2015	Mar. 31, 2016	Mar. 31, 2015
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Gain (loss) from operations			$ 0.0	$ (2.4)
Loss on sale			0.0	(0.7)
Loss from discontinued operations before income taxes			0.0	(3.2)
Provision (benefit) for income taxes			0.0	(0.8)
Loss from discontinued operations, net of tax			0.0	(2.4)
Other
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Adjustments to contingencies of former operations			$ 0.0	$ (0.1)
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