Debt and Credit Facilities (Narrative) (Details) - USD ($) $ in Millions	9 Months Ended
Sep. 30, 2017	Dec. 31, 2016	Feb. 29, 2016
Short-term borrowings and current maturities of long-term debt	$ 1,106.7	$ 360.8
Line of credit facility, amount outstanding	2,000.0
Debt Instrument, Fair Value Disclosure	4,400.0
Five Year Revolving Credit Facility Refinanced [Member]
Line of credit facility, amount outstanding	2,000.0
Five Year Revolving Credit Facility [Member]
Line of credit facility, amount outstanding	1,000.0
Debentures With Put Feature [Member]
Short-term borrowings and current maturities of long-term debt	$ 343.0	$ 343.0
Debt Instrument, Maturity Date Range, Start	Jan. 01, 2027
Debt instrument, maturity date range, end	Dec. 31, 2028
Debentures with put option available to be exercised			$ 37.2
2.875% Senior notes due 2019 [Member]
Debt Instrument, Interest Rate, Stated Percentage	2.875%	2.875%
4.25% Senior notes due 2023 [Member]
Debt Instrument, Interest Rate, Stated Percentage	4.25%	4.25%
5.75% Senior notes due 2043 [Member]
Debt Instrument, Interest Rate, Stated Percentage	5.75%	5.75%
Two Point Six Two Five Percent Senior Notes Due Two Thousand Twenty [Member]
Debt Instrument, Interest Rate, Stated Percentage	2.625%	2.625%
Three Point Five Five Percent Senior Notes due 2024 [Member]
Debt Instrument, Interest Rate, Stated Percentage	3.55%	3.55%
Four Point Six Five Percent Senior Notes due Twenty Forty Four [Member]
Debt Instrument, Interest Rate, Stated Percentage	4.65%	4.65%

Outstanding Debentures with Put Option that can be exercised at the holders option

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- Definition

Amount of short-term debt and current maturity of long-term debt and capital lease obligations due within one year or the normal operating cycle, if longer.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
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- Definition

Fair value portion of debt instrument payable, including, but not limited to, notes payable and loans payable.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 10
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- Definition

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

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-Name Accounting Standards Codification
-Topic 210
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- Definition

Latest date the outstanding debt instruments are required to be repaid, in CCYY-MM-DD format.

+ References

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Earliest date the outstanding debt instruments are required to be repaid, in CCYY-MM-DD format.

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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.

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