Debt - Debt and Average Interest Rates on Debt Outstanding (Detail) - USD ($) $ in Millions	Sep. 30, 2017	Dec. 31, 2016
Debt Instrument [Line Items]
Unamortized Debt Issuance Expense	$ (7.8)	$ (17.8)
Total debt	1,503.4	4,279.2
Current maturities and short-term borrowings	0.0	(0.8)
Long-term debt	$ 1,503.4	4,278.4
Commercial Paper [Member]
Debt Instrument [Line Items]
Debt, Weighted Average Interest Rate	2.10%
Commercial Paper	$ 116.0	398.7
Senior Notes 1.875% Due 2017 \| Senior Notes [Member]
Debt Instrument [Line Items]
Debt, Weighted Average Interest Rate	1.875%
Total debt	$ 0.0	350.0
Senior Notes 2.900% Due 2018 \| Senior Notes [Member]
Debt Instrument [Line Items]
Debt, Weighted Average Interest Rate	2.90%
Total debt	$ 255.3	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	$ 587.3	520.7
Senior Notes 3.625% Due 2020 \| Senior Notes [Member]
Debt Instrument [Line Items]
Debt, Weighted Average Interest Rate	3.625%
Total debt	$ 74.0	400.0
Senior Notes 5.000% Due 2021 \| Senior Notes [Member]
Debt Instrument [Line Items]
Debt, Weighted Average Interest Rate	5.00%
Total debt	$ 103.8	500.0
Senior Notes 3.150% Due 2022 \| Senior Notes [Member]
Debt Instrument [Line Items]
Debt, Weighted Average Interest Rate	3.15%
Total debt	$ 88.3	550.0
Senior Notes 4.65% Due 2025 \| Senior Notes [Member]
Debt Instrument [Line Items]
Debt, Weighted Average Interest Rate	4.65%
Total debt	$ 19.3	250.0
Other Debt Obligations [Member] \| Other Debt Obligations [Member]
Debt Instrument [Line Items]
Total debt	$ 0.0	0.8
Revolving Credit Facility [Member] \| Long Term Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Debt, Weighted Average Interest Rate	2.732%
Total debt	$ 17.2	$ 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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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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The remaining balance of debt issuance expenses that were capitalized and are being amortized against income over the lives of the respective bond issues. This does not include the amounts capitalized as part of the cost of the utility plant or asset.

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