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Debt (Detail) - USD ($) $ in Millions		Sep. 30, 2020	Dec. 31, 2019	Sep. 30, 2019
Debt Instrument [Line Items]
Fair Value		$ 6,687.4	$ 5,119.6	$ 5,113.3
Debt, Long-term and Short-term, Combined Amount	[1]	5,395.4	4,407.1	4,406.5
3.75% Senior Notes due 2021
Debt Instrument [Line Items]
Long-term Debt		499.7	499.4	499.3
Fair Value		515.3	515.6	516.5
2.45% Senior Notes due 2027
Debt Instrument [Line Items]
Long-term Debt		497.2	496.9	496.8
Fair Value		532.0	501.5	502.1
6 5/8% Senior Notes due 2029
Debt Instrument [Line Items]
Long-term Debt		296.8	296.6	296.5
Fair Value		411.4	392.5	392.2
4.00% Senior Notes due 2029
Debt Instrument [Line Items]
Long-term Debt		545.3	545.0	544.9
Fair Value		662.5	614.3	617.0
Senior Notes Three Point Two Zero Percent Due Twenty Thirty [Member]
Debt Instrument [Line Items]
Long-term Debt		496.0	0.0	0.0
Fair Value		572.4	0.0	0.0
6.25% Senior Notes due 2032
Debt Instrument [Line Items]
Long-term Debt		395.9	395.7	395.7
Fair Value		587.2	552.6	547.2
4.35% Senior Notes due 2044
Debt Instrument [Line Items]
Long-term Debt		346.7	346.7	346.6
Fair Value		450.5	417.0	414.7
3.70% Senior Notes due 2045
Debt Instrument [Line Items]
Long-term Debt		395.5	395.4	395.4
Fair Value		473.5	434.2	431.8
4.125% Senior Notes due 2047
Debt Instrument [Line Items]
Long-term Debt		841.7	841.6	841.5
Fair Value		1,078.5	986.1	987.4
4.20% Senior Notes due 2048
Debt Instrument [Line Items]
Long-term Debt		590.0	589.8	589.8
Fair Value		775.3	705.8	704.4
Senior Notes Three Point Nine Five Percent Due Twenty Fifty [Member]
Debt Instrument [Line Items]
Long-term Debt		490.6	0.0	0.0
Fair Value		$ 628.8	$ 0.0	$ 0.0
[1] Consists of both short-term and long-term debt, including $500 million principal amount of 3.75% Senior Notes due August 2021. See Note 4 – Debt for further discussion.

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 20
-Section 50
-Paragraph 4
-Subparagraph (b)(3)
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-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
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-Section S99
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