Capital Stock (Cash Dividend Activity) (Details) (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended	12 Months Ended
Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Capital [Abstract]
Declaration Date	Oct. 28, 2014	Jul. 29, 2014	Apr. 29, 2014	Jan. 28, 2014
Record Date	Dec. 05, 2014	Sep. 10, 2014	Jun. 10, 2014	Mar. 10, 2014
Payment Date	Dec. 22, 2014	Sep. 25, 2014	Jun. 25, 2014	Mar. 25, 2014
Cash Dividend per Share	$ 0.4375	$ 0.4375	$ 0.4375	$ 0.4375
Total	$ 117.6us-gaap_PaymentsOfDividends	$ 119.2us-gaap_PaymentsOfDividends	$ 120.5us-gaap_PaymentsOfDividends	$ 123.4us-gaap_PaymentsOfDividends	$ 480.7us-gaap_PaymentsOfDividends	$ 448.0us-gaap_PaymentsOfDividends	$ 367.1us-gaap_PaymentsOfDividends

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Aggregate dividends paid during the period for each share of common stock outstanding.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 04

-Article 3

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 505

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.3-04)

-URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770

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- Definition

Date the declared dividend will be paid, in CCYY-MM-DD format.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 50

-Paragraph 3

-URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4304-108586

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- Definition

Date the dividend to be paid was declared, in CCYY-MM-DD format.

+ References

+ Details

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- Definition

Date the holder must own the stock to be entitled to the dividend, in CCYY-MM-DD format.

+ References

No definition available.

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- Definition

Cash outflow in the form of capital distributions and dividends to common shareholders, preferred shareholders and noncontrolling interests.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Financing Activities

-URI http://asc.fasb.org/extlink&oid=6513228

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 15

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3291-108585

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