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Summary of Significant Accounting Policies Fair Values of Derivative Instruments Included on Consolidated Balance Sheet (Detail) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Derivatives, Fair Value [Line Items] |  |  |
Asset Derivatives Fair Value | $ 224.7 | $ 206.3 |
Liability Derivatives Fair Value | 11.3 | 16.6 |
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Net of Tax | (20.4) | 48.9 | $ (39.4)
Accumulated Other Comprehensive Income (Loss), Cumulative Changes in Net Gain (Loss) from Cash Flow Hedges, Effect Net of Tax | 12.0 |  |
Designated as Hedging Instrument |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Asset Derivatives Fair Value | 31.6 | 34.7 |
Liability Derivatives Fair Value | 6.4 | 13.9 |
Not Designated as Hedging Instrument [Member] |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Asset Derivatives Fair Value | 193.1 | 171.6 |
Liability Derivatives Fair Value | 4.9 | 2.7 |
Gain (Loss) Recognized in Income on Derivative | 86.0 | 22.5 |
Royalty Arrangement |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Derivative, Notional Amount | $ 754.7 |  |
Period covered by hedge | 18 months |  |
Foreign currency | Not Designated as Hedging Instrument [Member] |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Gain (Loss) Recognized in Income on Derivative | $ 14.2 | 22.1 |
Foreign currency | Prepaid expenses and other current assets | Designated as Hedging Instrument |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Asset Derivatives Fair Value | 10.0 | 30.9 |
Foreign currency | Prepaid expenses and other current assets | Not Designated as Hedging Instrument [Member] |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Asset Derivatives Fair Value | 12.4 | 4.5 |
Foreign currency | Accrued payroll and other liabilities | Designated as Hedging Instrument |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Liability Derivatives Fair Value | 5.2 | 0.7 |
Foreign currency | Accrued payroll and other liabilities | Not Designated as Hedging Instrument [Member] |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Liability Derivatives Fair Value | 4.8 | 0.0 |
Foreign currency | Miscellaneous other assets | Designated as Hedging Instrument |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Asset Derivatives Fair Value | 9.5 | 3.8 |
Foreign currency | Other long- term liabilities | Designated as Hedging Instrument |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Liability Derivatives Fair Value | 1.2 | 1.3 |
Interest rate | Accrued payroll and other liabilities | Designated as Hedging Instrument |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Liability Derivatives Fair Value | 0.0 | 0.1 |
Interest rate | Miscellaneous other assets | Designated as Hedging Instrument |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Asset Derivatives Fair Value | 12.1 | 0.0 |
Interest rate | Other long- term liabilities | Designated as Hedging Instrument |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Liability Derivatives Fair Value | 0.0 | 11.8 |
Equity | Not Designated as Hedging Instrument [Member] |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Gain (Loss) Recognized in Income on Derivative | 71.8 | 0.4 |
Equity | Prepaid expenses and other current assets | Not Designated as Hedging Instrument [Member] |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Asset Derivatives Fair Value | 1.6 | 167.1 |
Equity | Accrued payroll and other liabilities | Not Designated as Hedging Instrument [Member] |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Liability Derivatives Fair Value | 0.1 | 2.7 |
Equity | Miscellaneous other assets | Not Designated as Hedging Instrument [Member] |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Asset Derivatives Fair Value | 179.1 | $ 0.0 |
Fair Value Hedging [Member] | Interest Rate Risk [Member] |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Increase (Decrease) in Fair Value of Interest Rate Fair Value Hedging Instruments | 12.1 |  |
Gain (Loss) Recognized in Income on Derivative | 24.0 |  |
Interest Rate Swap [Member] |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Derivative, Notional Amount | 998.5 |  |
Intercompany Debt [Member] |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Notional Amount of Nonderivative Instruments | 642.6 |  |
Debt [Member] |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Notional Amount of Nonderivative Instruments | $ 11,900.0 |  |

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- Definition Fair value, before effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets elected not to be offset. Excludes assets not subject to a master netting arrangement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=99393222&loc=SL20226000-175313 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 20 -Section 50 -Paragraph 4D -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=118948506&loc=SL51823488-111719 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4B -Subparagraph (a),(c) -URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5624163-113959 + Details
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- Definition Amount of unrealized gain (loss) related to the fair value of interest rate derivatives designated as fair value hedging instruments, as offset by the gain (loss) on the hedged item to the extent that the fair value hedge is determined to be effective. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5618551-113959 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5624171-113959 + Details
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