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Fair Value Measurements (Tables)
 9 Months Ended
Sep. 30, 2018
Fair Value Disclosures [Abstract]  
Summary of assets and liabilities recorded at fair value
The tables below present information about our assets and liabilities that are regularly measured and carried at fair value and indicate the level within the fair value hierarchy of the valuation techniques we utilized to determine such fair value:
As of September 30, 2018 (In millions)
Total
 
Quoted Prices
in Active
Markets
(Level 1)
 
Significant Other
Observable Inputs
(Level 2)
 
Significant
Unobservable
Inputs
(Level 3)
Assets:
 
 
 
 
 
 
 
Cash equivalents
$
1,900.9

 
$
—

 
$
1,900.9

 
$
—

Marketable debt securities:
 
 
 
 
 
 
 
Corporate debt securities
1,951.6

 
—

 
1,951.6

 
—

Government securities
1,060.9

 
—

 
1,060.9

 
—

Mortgage and other asset backed securities
273.7

 
—

 
273.7

 
—

Marketable equity securities
624.8

 
95.6

 
529.2

 
—

Derivative contracts
35.1

 
—

 
35.1

 
—

Plan assets for deferred compensation
26.4

 
—

 
26.4

 
—

Total
$
5,873.4

 
$
95.6

 
$
5,777.8

 
$
—

Liabilities:
 
 
 
 
 
 
 
Derivative contracts
$
31.2

 
$
—

 
$
31.2

 
$
—

Contingent consideration obligations
412.0

 
—

 
—

 
412.0

Total
$
443.2

 
$
—

 
$
31.2

 
$
412.0


As of December 31, 2017 (In millions)
Total
 
Quoted Prices
in Active
Markets
(Level 1)
 
Significant Other
Observable Inputs
(Level 2)
 
Significant
Unobservable
Inputs
(Level 3)
Assets:
 
 
 
 
 
 
 
Cash equivalents
$
1,229.4

 
$
—

 
$
1,229.4

 
$
—

Marketable debt securities:
 
 
 
 
 
 
 
Corporate debt securities
2,609.8

 
—

 
2,609.8

 
—

Government securities
1,919.3

 
—

 
1,919.3

 
—

Mortgage and other asset backed securities
643.4

 
—

 
643.4

 
—

Marketable equity securities
11.8

 
11.8

 
—

 
—

Derivative contracts
2.7

 
—

 
2.7

 
—

Plan assets for deferred compensation
28.5

 
—

 
28.5

 
—

Total
$
6,444.9

 
$
11.8

 
$
6,433.1

 
$
—

Liabilities:
 
 
 
 
 
 
 
Derivative contracts
$
111.3

 
$
—

 
$
111.3

 
$
—

Contingent consideration obligations
523.6

 
—

 
—

 
523.6

Total
$
634.9

 
$
—

 
$
111.3

 
$
523.6
Summary of fair and carrying value of debt instruments
The fair and carrying values of our debt instruments, which are Level 2 liabilities, are summarized as follows:
 
As of September 30, 2018
 
As of December 31, 2017
(In millions)
Fair
Value
 
Carrying
Value
 
Fair
Value
 
Carrying
Value
Notes payable to Fumedica AG
$
—

 
$
—

 
$
3.2

 
$
3.2

2.900% Senior Notes due September 15, 2020
1,491.6

 
1,476.2

 
1,517.7

 
1,482.4

3.625% Senior Notes due September 15, 2022
1,001.7

 
995.2

 
1,032.9

 
994.3

4.050% Senior Notes due September 15, 2025
1,756.6

 
1,737.4

 
1,851.9

 
1,736.3

5.200% Senior Notes due September 15, 2045
1,861.1

 
1,722.3

 
2,077.6

 
1,722.0

Total
$
6,111.0

 
$
5,931.1

 
$
6,483.3

 
$
5,938.2
Fair value of contingent consideration obligations
The following table provides a roll forward of the fair values of our contingent consideration obligations, which includes Level 3 measurements:
 
For the Three Months
Ended September 30,
 
For the Nine Months
Ended September 30,
(In millions)
2018
 
2017
 
2018
 
2017
Fair value, beginning of period
$
499.9

 
$
492.1

 
$
523.6

 
$
467.6

Changes in fair value
(87.9
)
 
30.0

 
(91.6
)
 
61.2

Payments
—

 
—

 
(20.0
)
 
(6.7
)
Fair value, end of period
$
412.0

 
$
522.1

 
$
412.0

 
$
522.1