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Debt - Other (Details) $ in Millions					9 Months Ended
	Sep. 03, 2020 USD ($)	Aug. 03, 2020 USD ($)	Apr. 12, 2013 USD ($)	Nov. 20, 2006 USD ($)	Sep. 30, 2021 USD ($) item	Dec. 31, 2020 USD ($)	Nov. 15, 2016 USD ($)
Debt
Total					$ 1,662.6	$ 1,663.7
Number of financial maintenance covenants | item					2
Unsecured revolving credit facility maturing September 3, 2025
Debt
Maximum borrowing capacity	$ 1,500.0
Debt term	5 years
Total					$ 0.0	0.0
Commitment fee on unused portion of revolving credit facility (as a percent)					0.20%
Letters of credit outstanding					$ 16.0
Unsecured revolving credit facility maturing September 3, 2025 | LIBOR
Debt
Variable interest rate					LIBOR
Interest rate added to base (as a percent)					1.25%
Unsecured revolving credit facility maturing September 3, 2025 | Bank prime rate
Debt
Variable interest rate					bank prime rate
Interest rate added to base (as a percent)					0.25%
Senior Unsecured Notes
Debt
Percentage of principal amount at which the notes may be required to be repurchased in event of a change of control and a downgrade of the entity's credit rating					101.00%
Senior unsecured notes issued November 20, 2006
Debt
Issuance of debt				$ 600.0
Senior unsecured notes due November 15, 2016
Debt
Total							$ 0.0
Interest rate (as a percent)				6.20%
Lump sum payment on maturity							$ 350.0
Issuance of debt				$ 350.0
Senior unsecured notes issued August 3, 2020
Debt
Issuance of debt		$ 900.0
Senior unsecured notes due August 15, 2025
Debt
Interest rate (as a percent)		1.30%
Issuance of debt		$ 400.0
Senior unsecured notes due August 15, 2030
Debt
Interest rate (as a percent)		2.15%
Issuance of debt		$ 500.0
Senior unsecured notes due April 15, 2023
Debt
Total					$ 500.0	500.0
Interest rate (as a percent)			4.50%
Issuance of debt			$ 500.0
Senior unsecured notes due November 15, 2036
Debt
Total					250.0	250.0
Interest rate (as a percent)				6.85%
Issuance of debt				$ 250.0
Other notes and revolving credit facilities
Debt
Maximum borrowing capacity					13.4
Total					4.6	5.4
IRB
Debt
Total					8.0	$ 8.3
Letter of Credit | Credit Agreement
Debt
Maximum borrowing capacity					50.0
Letters of credit outstanding					$ 23.0

X

- Definition

Represents the lump sum amount payable at the maturity of the debt instrument.

+ References

No definition available.

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- Definition

Represents the redemption price as a percentage of the principal amount at which the debt instrument may be required to be redeemed by the entity in the event of a change of control and downgrade of the entity's credit rating.

+ References

No definition available.

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- Definition

The number of financial maintenance covenants.

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- Definition

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

+ References

No definition available.

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- Definition

The reference rate for the variable rate of the debt instrument, such as LIBOR or the US Treasury rate and the maturity of the reference rate used, such as three months or six months LIBOR.

+ References

No definition available.

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- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

+ 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
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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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Period of time between issuance and maturity of debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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- Definition

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

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- Definition

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

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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
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- Definition

The fee, expressed as a percentage of the line of credit facility, for available but unused credit capacity under the credit facility.

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- Definition

The cash inflow during the period from additional borrowings in aggregate debt. Includes proceeds from short-term and long-term debt.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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