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

12 Months Ended

Dec. 31, 2018

Dec. 31, 2017

Dec. 31, 2016

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):

	2018			2017
Railcars	$	19.3		$	19.3
Less: allowance for depreciation	(2.4		)	(1.6		)
	$	16.9		$	17.7

Operating Leases, Rent Expense

$ 65.9

$ 67.4

$ 77.6

Leases (Textual) [Abstract]

Rental income from usage rents

$ 65.4

$ 64.5

$ 74.5

Railroad Transportation Equipment [Member]

Operating Leased Assets [Line Items]

Schedule of Capital Leased Assets [Table Text Block]

8400

Marine vessels [Member]

Operating Leased Assets [Line Items]

Schedule of Capital Leased Assets [Table Text Block]

2