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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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