Consolidated Statements of Cash Flows (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Operating Activities
Net income	$ 137.3	$ 110.8	$ 80.8
Adjustments to reconcile income to net cash provided by operating activities:
Gains on sales of assets	(61.4)	(70.1)	(43.5)
Depreciation	249.4	238.5	228.1
Asset impairment charges	5.0	6.8	8.3
Deferred income taxes	24.4	22.7	1.4
Share of affiliates’ earnings, net of dividends	15.5	(3.2)	8.1
Change in income taxes payable	(9.4)	9.1	(7.3)
Change in accrued operating lease expense	(11.0)	(7.6)	(13.1)
Employee benefit plans	0.8	(5.3)	(21.6)
Other	19.6	5.1	2.5
Net cash provided by operating activities	370.2	306.8	243.7
Investing Activities
Additions to operating assets and facilities	(739.3)	(466.4)	(520.2)
Loans extended	(1.0)	(31.9)	0
Investments in affiliates	(29.7)	(116.2)	(64.7)
Other	0	(0.1)	(0.2)
Portfolio investments and capital additions	(770.0)	(614.6)	(585.1)
Purchases of leased-in assets	(1.3)	(61.1)	(5.3)
Portfolio proceeds	288.9	154.1	84.3
Proceeds from sales of other assets	28.4	42.2	30.4
Proceeds from sale-leasebacks	104.9	0	79.0
Net decrease (increase) in restricted cash	5.5	21.4	(23.4)
Other	0	0	2.4
Net cash used in investing activities	(343.6)	(458.0)	(417.7)
Financing Activities
Net proceeds from issuances of debt (original maturities longer than 90 days)	445.2	790.3	573.8
Repayments of debt (original maturities longer than 90 days)	(671.2)	(312.8)	(344.2)
Net increase (decrease) in debt with original maturities of 90 days or less	243.3	(85.0)	46.8
Payments on capital lease obligations	(3.0)	(18.5)	(12.8)
Dividends	(58.8)	(56.0)	(53.5)
Other	4.6	5.2	0.9
Net cash (used in) provided by financing activities	(39.9)	323.2	211.0
Effect of Exchange Rate Changes on Cash and Cash Equivalents	(0.9)	(2.1)	(0.2)
Net (decrease) increase in Cash and Cash Equivalents during the period	(14.2)	169.9	36.8
Cash and Cash Equivalents at beginning of period	248.4	78.5	41.7
Cash and Cash Equivalents at end of period	$ 234.2	$ 248.4	$ 78.5