Consolidated Statements of Cash Flows - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Operating Activities
Net income	$ 257.1	$ 205.3	$ 205.0
Adjustments to reconcile income to net cash provided by operating activities:
Depreciation	310.2	303.3	287.0
Share-based Compensation	15.8	11.6	14.0
Asset Impairment Charges	38.5	33.9	1.3
Gains on sales of assets	(52.9)	(99.7)	(79.3)
Deferred income taxes	72.8	90.2	61.4
Share of affiliates’ earnings, net of dividends	(12.2)	(13.7)	(9.5)
Change in income taxes payable	(5.7)	7.4	(4.4)
Change in accrued operating lease expense	3.0	(24.2)	(5.2)
Employee benefit plans	7.1	10.6	3.7
Other	(7.6)	9.6	(24.8)
Net cash provided by operating activities	626.1	534.3	449.2
Investing Activities
Additions to operating assets and facilities	(595.7)	(681.4)	(1,015.2)
Investments in affiliates	(25.0)	(15.5)	(15.3)
Portfolio investments and capital additions	(620.7)	(696.9)	(1,030.5)
Purchases of leased-in assets	(117.1)	(118.4)	(150.5)
Portfolio proceeds	223.7	482.2	264.0
Proceeds from sales of other assets	23.0	18.7	26.9
Proceeds from sale-leasebacks	82.5	0.0	0.0
Net decrease (increase) in restricted cash	13.7	(2.9)	5.8
Payments for (Proceeds from) Other Investing Activities	0.0	9.7	5.8
Net cash used in investing activities	(394.9)	(307.6)	(878.5)
Financing Activities
Net proceeds from issuances of debt (original maturities longer than 90 days)	859.4	748.8	1,223.0
Repayments of debt (original maturities longer than 90 days)	(800.0)	(726.3)	(819.8)
Net increase (decrease) in debt with original maturities of 90 days or less	(3.6)	(64.5)	50.0
Payments on capital lease obligations	(3.6)	(2.7)	(2.6)
Stock repurchases	(120.1)	(125.4)	(124.6)
Dividends	(67.4)	(68.2)	(62.0)
Other	10.4	9.3	(1.8)
Net cash (used in) provided by financing activities	(124.9)	(229.0)	262.2
Effect of Exchange Rate Changes on Cash and Cash Equivalents	(1.2)	(5.2)	(2.7)
Net (decrease) increase in Cash and Cash Equivalents during the period	105.1	(7.5)	(169.8)
Cash and Cash Equivalents at beginning of period	202.4	209.9	379.7
Cash and Cash Equivalents at end of period	$ 307.5	$ 202.4	$ 209.9