Debt - Debt Outstanding and Average Interest Rates (Detail) (USD $) In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Debt Disclosure [Line Items]
Total debt	$ 3,004.1	$ 2,550.4
Less: Current maturities and short-term borrowings	(6.7)us-gaap_DebtCurrent	(2.5)us-gaap_DebtCurrent
Long-term debt	2,997.4us-gaap_LongTermDebtNoncurrent	2,547.9us-gaap_LongTermDebtNoncurrent
Commercial Paper
Debt Disclosure [Line Items]
Debt, average interest rate	0.679%
Total debt	987.6	528.9
Capital Lease Obligations
Debt Disclosure [Line Items]
Debt, average interest rate	6.195%
Total debt	6.7	21.5
Long Term Revolving Credit Facility [Member]
Debt Disclosure [Line Items]
Debt, average interest rate	1.421%
Total debt	9.8	0
Senior Notes 1.350% due 2015 \| Senior Notes
Debt Disclosure [Line Items]
Debt, average interest rate	1.35%
Total debt	350.0	350.0
Senior Notes 1.875 % due 2017 \| Senior Notes
Debt Disclosure [Line Items]
Debt, average interest rate	1.875%
Total debt	350.0	350.0
Senior Notes 2.650% due 2019 \| Senior Notes
Debt Disclosure [Line Items]
Debt, average interest rate	2.65%
Total debt	250.0	250.0
Senior Notes, 5.000% Due 2021 \| Senior Notes
Debt Disclosure [Line Items]
Debt, average interest rate	5.00%
Total debt	500.0	500.0
Senior Notes 3.150% due 2022 \| Senior Notes
Debt Disclosure [Line Items]
Debt, average interest rate	3.15%
Total debt	$ 550.0	$ 550.0

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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

-Subparagraph (SX 210.5-02.19,20)

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 19

-Article 5

+ Details

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- Definition

Represents the aggregate of total long-term debt, including current maturities and short-term debt.

+ References

No definition available.

+ Details

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- Definition

Weighted average interest rate of debt outstanding.

+ References

No definition available.

+ Details

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- Definition

Carrying amount of long-term debt, net of unamortized discount or premium, excluding amounts to be repaid within one year or the normal operating cycle, if longer (current maturities). 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 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.22)

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 22

-Article 5

+ Details

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