Debt - Debt and Average Interest Rates on Debt Outstanding (Detail) - USD ($) $ in Millions	Mar. 31, 2017	Dec. 31, 2016
Debt Instrument [Line Items]
Unamortized Debt Issuance Expense	$ (16.4)	$ (17.8)
Total debt	4,529.6	4,279.2
Current maturities and short-term borrowings	(0.7)	(0.8)
Long-term debt	$ 4,528.9	4,278.4
Commercial Paper [Member]
Debt Instrument [Line Items]
Debt, Weighted Average Interest Rate	1.962%
Commercial Paper	$ 532.7	398.7
Senior Notes 1.875% Due 2017 \| Senior Notes [Member]
Debt Instrument [Line Items]
Debt, Weighted Average Interest Rate	1.875%
Total debt	$ 350.0	350.0
Senior Notes 2.900% Due 2018 \| Senior Notes [Member]
Debt Instrument [Line Items]
Debt, Weighted Average Interest Rate	2.90%
Total debt	$ 500.0	500.0
Senior Notes 2.650% Due 2019 \| Senior Notes [Member]
Debt Instrument [Line Items]
Debt, Weighted Average Interest Rate	2.65%
Total debt	$ 250.0	250.0
Senior Notes 2.45% Due 2019 \| Senior Notes [Member]
Debt Instrument [Line Items]
Debt, Weighted Average Interest Rate	2.45%
Total debt	$ 540.7	520.7
Senior Notes 3.625% Due 2020 \| Senior Notes [Member]
Debt Instrument [Line Items]
Debt, Weighted Average Interest Rate	3.625%
Total debt	$ 400.0	400.0
Senior Notes 5.000% Due 2021 \| Senior Notes [Member]
Debt Instrument [Line Items]
Debt, Weighted Average Interest Rate	5.00%
Total debt	$ 500.0	500.0
Senior Notes 3.150% Due 2022 \| Senior Notes [Member]
Debt Instrument [Line Items]
Debt, Weighted Average Interest Rate	3.15%
Total debt	$ 550.0	550.0
Senior Notes 4.65% Due 2025 \| Senior Notes [Member]
Debt Instrument [Line Items]
Debt, Weighted Average Interest Rate	4.65%
Total debt	$ 250.0	250.0
Other Debt Obligations [Member] \| Other Debt Obligations [Member]
Debt Instrument [Line Items]
Total debt	$ 0.7	0.8
Revolving Credit Facility [Member] \| Long Term Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Debt, Weighted Average Interest Rate	2.446%
Total debt	$ 671.9	$ 576.8

Carrying value as of the balance sheet date of short-term borrowings using unsecured obligations issued by banks, corporations and other borrowers to investors. The maturities of these money market securities generally do not exceed 270 days.

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)(a)(3))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 2: 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 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(13)(2))
-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

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- Definition

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- Definition

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

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- Definition

Weighted average interest rate of debt outstanding.

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