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Financial Instruments - Summary Of Cash And Available-For-Sale Securities (Detail) - USD ($) $ in Millions | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
--- | --- | --- | --- | ---
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Amortized Cost | $ 3,861.7 | $ 4,850.0 |  |
Gross Unrealized Gains | 0.2 | 1.3 |  |
Gross Unrealized Losses | (15.4) | (13.4) |  |
Fair Value | 3,846.5 | 4,837.9 |  |
Cash and Cash Equivalents | 648.2 | 1,036.6 | $ 714.6 | $ 600.3
Short-term Investments | 1,312.4 | 1,518.0 |  |
Long-term Investments | 1,885.9 | 2,283.3 |  |
Cash |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Amortized Cost | 197.7 | 227.7 |  |
Gross Unrealized Gains | 0.0 | 0.0 |  |
Gross Unrealized Losses | 0.0 | 0.0 |  |
Fair Value | 197.7 | 227.7 |  |
Cash and Cash Equivalents | 197.7 | 227.7 |  |
Short-term Investments | 0.0 | 0.0 |  |
Long-term Investments | 0.0 | 0.0 |  |
Level 1 |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Amortized Cost | 1,474.1 | 1,238.3 |  |
Gross Unrealized Gains | 0.0 | 0.1 |  |
Gross Unrealized Losses | (4.7) | (2.0) |  |
Fair Value | 1,469.4 | 1,236.4 |  |
Cash and Cash Equivalents | 450.5 | 770.3 |  |
Short-term Investments | 396.2 | 168.4 |  |
Long-term Investments | 622.7 | 297.7 |  |
Level 1 | Money market funds |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Amortized Cost | 445.0 | 612.4 |  |
Gross Unrealized Gains | 0.0 | 0.0 |  |
Gross Unrealized Losses | 0.0 | 0.0 |  |
Fair Value | 445.0 | 612.4 |  |
Cash and Cash Equivalents | 445.0 | 612.4 |  |
Short-term Investments | 0.0 | 0.0 |  |
Long-term Investments | 0.0 | 0.0 |  |
Level 1 | U.S. treasuries |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Amortized Cost | 1,029.1 | 625.9 |  |
Gross Unrealized Gains | 0.0 | 0.1 |  |
Gross Unrealized Losses | (4.7) | (2.0) |  |
Fair Value | 1,024.4 | 624.0 |  |
Cash and Cash Equivalents | 5.5 | 157.9 |  |
Short-term Investments | 396.2 | 168.4 |  |
Long-term Investments | 622.7 | 297.7 |  |
Level 2 |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Amortized Cost | 2,189.9 | 3,384.0 |  |
Gross Unrealized Gains | 0.2 | 1.2 |  |
Gross Unrealized Losses | (10.7) | (11.4) |  |
Fair Value | 2,179.4 | 3,373.8 |  |
Cash and Cash Equivalents | 0.0 | 38.6 |  |
Short-term Investments | 916.2 | 1,349.6 |  |
Long-term Investments | 1,263.2 | 1,985.6 |  |
Level 2 | Commercial paper |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Amortized Cost | 38.4 | 139.6 |  |
Gross Unrealized Gains | 0.0 | 0.0 |  |
Gross Unrealized Losses | 0.0 | 0.0 |  |
Fair Value | 38.4 | 139.6 |  |
Cash and Cash Equivalents | 0.0 | 31.1 |  |
Short-term Investments | 38.4 | 108.5 |  |
Long-term Investments | 0.0 | 0.0 |  |
Level 2 | Corporate securities |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Amortized Cost | 946.6 | 1,471.8 |  |
Gross Unrealized Gains | 0.2 | 0.7 |  |
Gross Unrealized Losses | (4.4) | (5.0) |  |
Fair Value | 942.4 | 1,467.5 |  |
Cash and Cash Equivalents | 0.0 | 2.9 |  |
Short-term Investments | 403.9 | 555.4 |  |
Long-term Investments | 538.5 | 909.2 |  |
Level 2 | U.S. government agencies |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Amortized Cost | 901.3 | 938.7 |  |
Gross Unrealized Gains | 0.0 | 0.5 |  |
Gross Unrealized Losses | (4.4) | (2.9) |  |
Fair Value | 896.9 | 936.3 |  |
Cash and Cash Equivalents | 0.0 | 0.0 |  |
Short-term Investments | 311.7 | 342.7 |  |
Long-term Investments | 585.2 | 593.6 |  |
Level 2 | Non-U.S. government securities |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Amortized Cost | 2.5 | 18.5 |  |
Gross Unrealized Gains | 0.0 | 0.0 |  |
Gross Unrealized Losses | 0.0 | 0.0 |  |
Fair Value | 2.5 | 18.5 |  |
Cash and Cash Equivalents | 0.0 | 0.0 |  |
Short-term Investments | 2.5 | 16.0 |  |
Long-term Investments | 0.0 | 2.5 |  |
Level 2 | Municipal securities |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Amortized Cost | 301.1 | 815.4 |  |
Gross Unrealized Gains | 0.0 | 0.0 |  |
Gross Unrealized Losses | (1.9) | (3.5) |  |
Fair Value | 299.2 | 811.9 |  |
Cash and Cash Equivalents | 0.0 | 4.6 |  |
Short-term Investments | 159.7 | 327.0 |  |
Long-term Investments | $ 139.5 | $ 480.3 |  |

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