Leases (Details Textual) - USD ($)
$ in Millions

12 Months Ended

Dec. 31, 2017

Dec. 31, 2016

Dec. 31, 2015

Operating Leased Assets [Line Items]

Schedule of Capital Leased Assets [Table Text Block]

The following table shows assets we financed with capital lease obligations as of December 31 (in millions):

	2017			2016
Railcars	$	19.3		$	18.9
Marine vessels (1)	—			62.1
Less: allowance for depreciation	(1.6		)	(61.6		)
	$	17.7		$	19.4

Operating Leases, Rent Expense

$ 67.4

$ 77.6

$ 91.2

Leases (Textual) [Abstract]

Rental income from usage rents

$ 64.5

$ 74.5

$ 91.2

Railroad Transportation Equipment [Member]

Operating Leased Assets [Line Items]

Schedule of Capital Leased Assets [Table Text Block]

10100

Marine vessels [Member]

Operating Leased Assets [Line Items]

Schedule of Capital Leased Assets [Table Text Block]

2