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Debt, Interest Income, Expense and Other Finance Costs - Narrative (Details) - USD ($)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Jul. 31, 2019
Debt Instrument [Line Items]
Expiration period	1 year
Credit Facility
Debt Instrument [Line Items]
Amount outstanding	$ 0	$ 55,000,000.0
Unused portion of facility	1,300,000,000	1,200,000,000
Letters of credit and bankers' acceptances
Debt Instrument [Line Items]
Amount outstanding	3,400,000	4,300,000
Other uncommitted credit lines
Debt Instrument [Line Items]
Letters of credit, outstanding amount	328,400,000	375,200,000
Credit Facility | Amended credit facility
Debt Instrument [Line Items]
Borrowing capacity	200,000,000.0
Maximum additional borrowings available at the entity's request subject to satisfaction of certain conditions	400,000,000.0
Credit Facility | Credit Facility
Debt Instrument [Line Items]
Borrowing capacity			$ 1,300,000,000
Long-term debt	0	55,000,000.0
Term Loans
Debt Instrument [Line Items]
Amount of term loan outstanding	$ 503,200,000	515,600,000
Term Loans | Base rate
Debt Instrument [Line Items]
Basis points added to reference rate	0.75%
Term Loans | Eurodollar
Debt Instrument [Line Items]
Basis points added to reference rate	1.75%
Term Loans | Term Loans
Debt Instrument [Line Items]
Long-term debt	$ 503,200,000	$ 515,600,000	$ 525,000,000.0

X

- Definition

Maximum additional borrowing capacity available under the credit facility at the entity's request subject to satisfaction of certain conditions.

+ References

No definition available.

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- Definition

Lines Of Credit, Expiration Period

+ References

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- Definition

Percentage points added to the reference rate to compute the variable rate on the debt instrument.

+ References

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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- Definition

Represents the aggregate of total long-term debt, including current maturities and short-term debt.

+ References

No definition available.

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- Definition

The total amount of the contingent obligation under letters of credit outstanding as of the reporting date.

+ References

No definition available.

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- Definition

Fair value of the amount outstanding under the credit facility.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 10
-URI http://asc.fasb.org/extlink&oid=121572278&loc=d3e13433-108611

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- Definition

Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.19(b),22(b))
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- Definition

Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding).

+ References

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-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
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- Definition

Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 20
-Section 50
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