Consolidated Statements of Cash Flows - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Operating Activities
Net income	$ 502.0	$ 257.1	$ 205.3
Adjustments to reconcile income to net cash provided by operating activities:
Depreciation	322.7	310.2	303.3
Change in accrued operating lease expense	(13.9)	3.0	(24.2)
Gains on sales of assets	(52.5)	(52.9)	(99.7)
Asset Impairment Charges	8.6	38.5	33.9
Employee benefit plans	3.3	7.1	10.6
Share-based Compensation	9.9	15.8	11.6
Deferred income taxes	(260.5)	72.8	90.2
Change in income taxes payable	(4.6)	(5.7)	7.4
Share of affiliates’ earnings, net of dividends	(13.7)	(12.2)	(13.7)
Other	(4.5)	(4.3)	17.1
Net cash provided by operating activities	496.8	629.4	541.8
Investing Activities
Additions to operating assets and facilities	(566.8)	(595.7)	(681.4)
Investments in affiliates	(36.6)	(25.0)	(15.5)
Portfolio investments and capital additions	(603.4)	(620.7)	(696.9)
Purchases of leased-in assets	(111.8)	(117.1)	(118.4)
Portfolio proceeds	165.6	223.7	482.2
Proceeds from sales of other assets	30.3	23.0	18.7
Proceeds from sale-leasebacks	90.6	82.5	0.0
Payments for (Proceeds from) Other Investing Activities	0.4	2.3	9.6
Net cash used in investing activities	(428.3)	(406.3)	(304.8)
Financing Activities
Net proceeds from issuances of debt (original maturities longer than 90 days)	792.6	859.4	748.8
Repayments of debt (original maturities longer than 90 days)	(703.0)	(800.0)	(726.3)
Net increase (decrease) in debt with original maturities of 90 days or less	(0.3)	(3.6)	(64.5)
Payments on capital lease obligations	(2.4)	(3.6)	(2.7)
Stock repurchases	(100.0)	(120.1)	(125.4)
Dividends	(68.2)	(67.4)	(68.2)
Other (add shares used to pay taxes)	(2.6)	4.8	1.8
Net cash (used in) provided by financing activities	(83.9)	(130.5)	(236.5)
Effect of Exchange Rate Changes on Cash and Cash Equivalents	4.0	(1.2)	(5.2)
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Excluding Exchange Rate Effect	(11.4)	91.4	(4.7)
Cash, Cash Equivalents, and Restricted Cash at beginning of period	311.1	219.7	224.4
Cash, Cash Equivalents, and Restricted Cash at end of period	$ 299.7	$ 311.1	$ 219.7

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Name:	us-gaap_SaleLeasebackTransactionNetProceedsInvestingActivities
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method.

+ References

+ Details

Name:	us-gaap_ShareBasedCompensation
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration