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Financing Arrangements - Long-term Debt (Details 2) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Nov. 13, 2017	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
Unfavorable Regulatory Action [Member] | 2015 Consent Decrees With EPA [Member]
Debt Instrument
Letters of Credit Outstanding, Amount		$ 50.0

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Long-term debt, prepayment

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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=109500613&loc=SL6031897-161870

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(16))
-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

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-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
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-SubTopic 210
-Section S99
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Contractual interest rate for funds borrowed, under the debt agreement.

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