Debt (Issuance of June 2016 Senior Notes) (Details) - Senior Notes - USD ($) $ in Millions	Dec. 31, 2017	Dec. 31, 2016	Jun. 09, 2016
2019 Senior Notes (2.500%)
Debt Instrument [Line Items]
Long-term debt	$ 999.5	$ 999.1	$ 1,000.0
Debt instrument, interest rate, stated percentage			2.50%
Debt Instrument, Unamortized Discount			$ 0.5
2021 Senior Notes (3.150%)
Debt Instrument [Line Items]
Long-term debt	2,248.2	2,247.7	$ 2,250.0
Debt instrument, interest rate, stated percentage			3.15%
Debt Instrument, Unamortized Discount			$ 1.8
2026 Senior Notes (3.950%)
Debt Instrument [Line Items]
Long-term debt	2,235.0	2,233.5	$ 2,250.0
Debt instrument, interest rate, stated percentage			3.95%
Debt Instrument, Unamortized Discount			$ 15.0
2046 Senior Notes (5.250%)
Debt Instrument [Line Items]
Long-term debt	$ 999.8	$ 999.8	$ 1,000.0
Debt instrument, interest rate, stated percentage			5.25%
Debt Instrument, Unamortized Discount			$ 0.2

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

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22(a)(1))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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Amount, after accumulated amortization, of debt discount.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 1A
-URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28541-108399

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 55
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=64930739&loc=d3e28878-108400

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Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(a)(16))
-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

Reference 2: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
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-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(16))
-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
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-Section S99
-Paragraph 1
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