Consolidated Statements of Cash Flows - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Operating Activities
Net income	$ 211.2	$ 211.3	$ 502.0
Adjustments to reconcile income to net cash provided by operating activities:
Depreciation	343.5	338.2	322.7
Gains on sales of assets	(66.7)	(79.4)	(52.5)
Asset Impairment Charges	6.6	9.0	8.6
Employee benefit plans	3.9	4.6	3.3
Share-based Payment Arrangement, Noncash Expense	12.3	16.4	9.9
Deferred income taxes	30.6	19.2	(260.5)
Share of affiliates’ earnings, net of dividends	(49.0)	(15.2)	(13.7)
Other	(29.8)	4.4	(23.0)
Net cash provided by operating activities	462.6	508.5	496.8
Investing Activities
Additions to operating assets and facilities	(741.7)	(929.3)	(566.8)
Investments in affiliates	0.0	(14.1)	(36.6)
Portfolio investments and capital additions	(741.7)	(943.4)	(603.4)
Purchases of leased-in assets	(1.0)	(66.6)	(111.8)
Portfolio proceeds	250.3	234.4	165.6
Proceeds from sales of other assets	23.0	37.3	30.3
Proceeds from sale-leasebacks	0.0	59.1	90.6
Proceeds from Insurance Settlement, Investing Activities	27.0
Payments for (Proceeds from) Other Investing Activities	2.7	3.1	0.4
Net cash used in investing activities	(439.7)	(676.1)	(428.3)
Financing Activities
Net proceeds from issuances of debt (original maturities longer than 90 days)	743.0	693.7	792.6
Repayments of debt (original maturities longer than 90 days)	(410.0)	(632.8)	(703.0)
Net increase (decrease) in debt with original maturities of 90 days or less	(94.6)	106.5	(0.3)
Payments on capital lease obligations	(11.3)	(1.2)	(2.4)
Stock repurchases	(150.0)	(115.5)	(100.0)
Dividends	(69.3)	(69.3)	(68.2)
Other (add shares used to pay taxes)	14.1	(2.8)	(2.6)
Net cash (used in) provided by financing activities	21.9	(21.4)	(83.9)
Effect of Exchange Rate Changes on Cash and Cash Equivalents	(0.5)	(4.0)	4.0
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Excluding Exchange Rate Effect	44.3	(193.0)	(11.4)
Cash, Cash Equivalents, and Restricted Cash at beginning of period	106.7	299.7	311.1
Cash, Cash Equivalents, and Restricted Cash at end of period	$ 151.0	$ 106.7	$ 299.7

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

- Definition

Amount of cash inflow from the sale of tangible or intangible assets used to produce goods or deliver services, classified as other.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 12
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3179-108585

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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=118932676&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=118932676&loc=d3e3291-108585

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Balance Type:	credit
Period Type:	duration

- 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/otherTransitionRef
-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 2: http://fasb.org/us-gaap/role/ref/otherTransitionRef
-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

Reference 3: http://fasb.org/us-gaap/role/ref/otherTransitionRef
-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

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

- Definition

Amount of noncash expense for share-based payment arrangement.

+ References

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