Consolidated Statements of Cash Flows - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Operating Activities
Net income	$ 211.3	$ 502.0	$ 257.1
Adjustments to reconcile income to net cash provided by operating activities:
Depreciation	338.2	322.7	310.2
Change in accrued operating lease expense	(4.0)	(13.9)	3.0
Gains on sales of assets	(79.4)	(52.5)	(52.9)
Asset Impairment Charges	9.0	8.6	38.5
Employee benefit plans	4.6	3.3	7.1
Share-based Compensation	16.4	9.9	15.8
Deferred income taxes	19.2	(260.5)	72.8
Share of affiliates’ earnings, net of dividends	(15.2)	(13.7)	(12.2)
Other	8.4	(9.1)	(10.0)
Net cash provided by operating activities	508.5	496.8	629.4
Investing Activities
Additions to operating assets and facilities	(929.3)	(566.8)	(595.7)
Investments in affiliates	(14.1)	(36.6)	(25.0)
Portfolio investments and capital additions	(943.4)	(603.4)	(620.7)
Purchases of leased-in assets	(66.6)	(111.8)	(117.1)
Portfolio proceeds	234.4	165.6	223.7
Proceeds from sales of other assets	37.3	30.3	23.0
Proceeds from sale-leasebacks	59.1	90.6	82.5
Payments for (Proceeds from) Other Investing Activities	3.1	0.4	2.3
Net cash used in investing activities	(676.1)	(428.3)	(406.3)
Financing Activities
Net proceeds from issuances of debt (original maturities longer than 90 days)	693.7	792.6	859.4
Repayments of debt (original maturities longer than 90 days)	(632.8)	(703.0)	(800.0)
Net increase (decrease) in debt with original maturities of 90 days or less	106.5	(0.3)	(3.6)
Payments on capital lease obligations	(1.2)	(2.4)	(3.6)
Stock repurchases	(115.5)	(100.0)	(120.1)
Dividends	(69.3)	(68.2)	(67.4)
Other (add shares used to pay taxes)	(2.8)	(2.6)	4.8
Net cash (used in) provided by financing activities	(21.4)	(83.9)	(130.5)
Effect of Exchange Rate Changes on Cash and Cash Equivalents	(4.0)	4.0	(1.2)
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Excluding Exchange Rate Effect	(193.0)	(11.4)	91.4
Cash, Cash Equivalents, and Restricted Cash at beginning of period	299.7	311.1	219.7
Cash, Cash Equivalents, and Restricted Cash at end of period	$ 106.7	$ 299.7	$ 311.1

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

- Definition

The cash outflow for the obligation for a lease meeting the criteria for capitalization (with maturities exceeding one year or beyond the operating cycle of the entity, if longer).

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 15
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3291-108585

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

The cash outflow for debt initially having maturity due after one year or beyond the normal operating cycle, if longer.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 15
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3291-108585

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- Definition

Amount of cash inflow after closing and debt issuance costs received by a seller-lessee in a sale-leaseback recognized in investing activities.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 840
-SubTopic 40
-Section 55
-Paragraph 51
-URI http://asc.fasb.org/extlink&oid=82846721&loc=d3e51840-112757

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 840
-SubTopic 40
-Section 55
-Paragraph 50
-URI http://asc.fasb.org/extlink&oid=82846721&loc=d3e51831-112757

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 840
-SubTopic 40
-Section 55
-Paragraph 52
-URI http://asc.fasb.org/extlink&oid=82846721&loc=d3e51843-112757

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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

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