Supplemental Cash Flow and Noncash Investing Transactions (Details) $ in Millions	12 Months Ended
	Dec. 31, 2015 USD ($) Car		Dec. 31, 2014 USD ($) Car	Dec. 31, 2013 USD ($) Car Vessel
Noncash or Part Noncash Divestitures [Line Items]
Capital Lease Obligations Incurred	$ 17.8
Capital Leases, Future Minimum Payments Due, Next Twelve Months			$ 0.0	$ 0.0
Number of railcars received | Car	157		62	640
Capital Lease Obligations Incurred	14.8
Number of vessels received | Vessel				5
Noncash or Part Noncash Acquisition, Value of Assets Acquired	$ 0.0		$ 1.1	$ 174.7
Supplemental Cash Flow Information
Interest paid	144.4	[1]	142.6	148.7
Income taxes paid (refunded), net	13.3		18.7	7.4
Portfolio proceeds	$ 482.2		$ 264.0	$ 385.3

[1] (1) Interest paid consisted of interest on debt obligations, interest rate swaps (net of interest received), and capital leases. The interest expense we capitalized as part of the cost of construction of major assets was immaterial for all periods presented.