Supplemental Cash Flow and Noncash Investing Transactions (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2014 Car		Dec. 31, 2013 Vessel Car	Dec. 31, 2012
Noncash or Part Noncash Divestitures [Line Items]
Number of railcars received	62		640
Number of vessels received			5
Noncash or Part Noncash Acquisition, Value of Assets Acquired	$ 1.1		$ 174.7
Fair Value of Assets Acquired	1.1		22.9	0
Supplemental Cash Flow Information
Interest paid	142.6	[1]	148.7	162.3
Income taxes paid (refunded), net	18.7		7.4	11.1
Portfolio proceeds	$ 264.0		$ 385.3	$ 288.9

[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.