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Financing Arrangements - Long-term Debt (Details 2) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2018	Nov. 18, 2016
Term Loan Facility
Debt Instrument
Long term debt including current maturities			$ 720.0
Long-term debt, prepayment		$ 684.0
Senior Notes | Senior Notes Due 2022 [Member]
Debt Instrument
Long term debt including current maturities	$ 550.0
Stated interest rate	3.25%
Senior Notes | Senior Notes Due 2027 [Member]
Debt Instrument
Long term debt including current maturities	$ 700.0
Stated interest rate	4.05%
Senior Notes | Senior Notes Due 2023
Debt Instrument
Long term debt including current maturities	$ 900.0
Stated interest rate	4.25%
Senior Notes | Senior Notes Due 2033
Debt Instrument
Long term debt including current maturities	$ 500.0
Stated interest rate	5.45%
Senior Notes | Senior Notes Due 2043
Debt Instrument
Long term debt including current maturities	$ 600.0
Stated interest rate	5.625%
Senior Notes | Senior Notes Due 2021
Debt Instrument
Long term debt including current maturities	$ 450.0
Stated interest rate	3.75%
Senior Notes | Senior Notes Due 2041
Debt Instrument
Long term debt including current maturities	$ 300.0
Stated interest rate	4.875%
Bank Loan
Debt Instrument
Interest rate margin on LIBOR	1.25%
Debentures | Debentures Due 2028
Debt Instrument
Long term debt including current maturities	$ 147.1

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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

Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 20
-Section 50
-Paragraph 4
-Subparagraph (b)(1)
-URI http://asc.fasb.org/extlink&oid=120520924&loc=SL6031897-161870

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
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-Name Accounting Standards Codification
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- Definition

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

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-Topic 210
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- Definition

The cash outflow from the repayment of long-term borrowing where a lender is placed in a lien position behind debt having a higher priority of repayment (senior) in case of liquidation of the entity's assets before its maturity.

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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=121586364&loc=d3e3291-108585

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