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INVESTMENTS | 6 Months Ended
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Jun. 30, 2018
Investments, Debt and Equity Securities [Abstract] |
INVESTMENTS | INVESTMENTS Debt Securities Investments in debt securities at the end of each period were as follows (in millions):
| June 30, 2018 |  | December 31, 2017
Held-to-maturity | Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Fair Value |  | Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses | Fair Value
Bank time deposits | $ | 45.7 |  |  | $ | — |  |  | $ | — |  |  | $ | 45.7 |  |  | $ | 382.9 |  |  | $ | — |  |  | $ | — |  |  | $ | 382.9 |
Commercial paper | — |  |  | — |  |  | — |  |  | — |  |  | 1.4 |  |  | — |  |  | — |  |  | 1.4 |
U.S. government and agency securities | 3.0 |  |  | — |  |  | — |  |  | 3.0 |  |  | 3.9 |  |  | — |  |  | — |  |  | 3.9 |
Total | $ | 48.7 |  |  | $ | — |  |  | $ | — |  |  | $ | 48.7 |  |  | $ | 388.2 |  |  | $ | — |  |  | $ | — |  |  | $ | 388.2 |
Available-for-sale |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Bank time deposits | $ | 0.5 |  |  | $ | — |  |  | $ | — |  |  | $ | 0.5 |  |  | $ | 0.5 |  |  | $ | — |  |  | $ | — |  |  | $ | 0.5 |
Commercial paper | 18.6 |  |  | — |  |  | — |  |  | 18.6 |  |  | 40.3 |  |  | — |  |  | — |  |  | 40.3 |
U.S. government and agency securities | 69.5 |  |  | — |  |  | (0.9 | ) |  | 68.6 |  |  | 69.4 |  |  | — |  |  | (0.7 | ) |  | 68.7 |
Foreign government bonds | 3.0 |  |  | — |  |  | — |  |  | 3.0 |  |  | 3.0 |  |  | — |  |  | — |  |  | 3.0 |
Asset-backed securities | 96.8 |  |  | 0.1 |  |  | (1.0 | ) |  | 95.9 |  |  | 121.2 |  |  | — |  |  | (0.4 | ) |  | 120.8 |
Corporate debt securities | 390.2 |  |  | 0.6 |  |  | (4.3 | ) |  | 386.5 |  |  | 446.5 |  |  | 0.8 |  |  | (1.8 | ) |  | 445.5 |
Municipal securities | 4.4 |  |  | — |  |  | — |  |  | 4.4 |  |  | 4.4 |  |  | — |  |  | — |  |  | 4.4 |
Total | $ | 583.0 |  |  | $ | 0.7 |  |  | $ | (6.2 | ) |  | $ | 577.5 |  |  | $ | 685.3 |  |  | $ | 0.8 |  |  | $ | (2.9 | ) |  | $ | 683.2 |
The cost and fair value of investments in debt securities, by contractual maturity, as of June 30, 2018 were as follows:
| Held-to-Maturity |  | Available-for-Sale
| Cost |  | Fair Value |  | Cost |  | Fair Value
| (in millions)
Due in 1 year or less | $ | 45.7 |  |  | $ | 45.7 |  |  | $ | 129.3 |  |  | $ | 128.7 |
Due after 1 year through 5 years | — |  |  | — |  |  | 361.7 |  |  | 357.6 |
Instruments not due at a single maturity date | 3.0 |  |  | 3.0 |  |  | 92.0 |  |  | 91.2 |
| $ | 48.7 |  |  | $ | 48.7 |  |  | $ | 583.0 |  |  | $ | 577.5 |
Actual maturities may differ from the contractual maturities due to call or prepayment rights. The following tables present gross unrealized losses and fair values for those investments that were in an unrealized loss position as of June 30, 2018 and December 31, 2017, aggregated by investment category and the length of time that individual securities have been in a continuous loss position (in millions):
| June 30, 2018
| Less than 12 Months |  | 12 Months or Greater |  | Total
| Fair Value |  | Gross Unrealized Losses |  | Fair Value |  | Gross Unrealized Losses |  | Fair Value |  | Gross Unrealized Losses
Commercial paper | $ | 24.6 |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | 24.6 |  |  | $ | — |
U.S. government and agency securities | 31.3 |  |  | (0.4 | ) |  | 37.0 |  |  | (0.5 | ) |  | 68.3 |  |  | (0.9 | )
Foreign government bonds | 3.0 |  |  | — |  |  | — |  |  | — |  |  | 3.0 |  |  | — |
Asset-backed securities | 73.7 |  |  | (0.8 | ) |  | 16.1 |  |  | (0.2 | ) |  | 89.8 |  |  | (1.0 | )
Corporate debt securities | 217.1 |  |  | (3.4 | ) |  | 51.9 |  |  | (0.9 | ) |  | 269.0 |  |  | (4.3 | )
Municipal securities | 4.3 |  |  | — |  |  | — |  |  | — |  |  | 4.3 |  |  | — |
| $ | 354.0 |  |  | $ | (4.6 | ) |  | $ | 105.0 |  |  | $ | (1.6 | ) |  | $ | 459.0 |  |  | $ | (6.2 | )
| December 31, 2017
| Less than 12 Months |  | 12 Months or Greater |  | Total
| Fair Value |  | Gross Unrealized Losses |  | Fair Value |  | Gross Unrealized Losses |  | Fair Value |  | Gross Unrealized Losses
Commercial paper | $ | 2.4 |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | 2.4 |  |  | $ | — |
U.S. government and agency securities | 31.5 |  |  | (0.2 | ) |  | 37.1 |  |  | (0.5 | ) |  | 68.6 |  |  | (0.7 | )
Foreign government bonds | 3.0 |  |  | — |  |  | — |  |  | — |  |  | 3.0 |  |  | — |
Asset-backed securities | 90.8 |  |  | (0.3 | ) |  | 23.2 |  |  | (0.1 | ) |  | 114.0 |  |  | (0.4 | )
Corporate debt securities | 253.3 |  |  | (1.2 | ) |  | 59.2 |  |  | (0.6 | ) |  | 312.5 |  |  | (1.8 | )
Municipal securities | 4.3 |  |  | — |  |  | — |  |  | — |  |  | 4.3 |  |  | — |
| $ | 385.3 |  |  | $ | (1.7 | ) |  | $ | 119.5 |  |  | $ | (1.2 | ) |  | $ | 504.8 |  |  | $ | (2.9 | )
Investments in Unconsolidated Affiliates The Company has a number of equity investments in privately and publicly held companies. Investments in these unconsolidated affiliates are recorded in "Long-term Investments" on the consolidated condensed balance sheets, and are as follows:
| June 30, 2018 |  | December 31, 2017
| (in millions)
Equity method investments |  |  |  |  |
Cost | 9.5 |  |  | 9.2 |
Equity in losses | (5.4 | ) |  | (5.1 | )
Carrying value of equity method investments | 4.1 |  |  | 4.1 |
Equity securities |  |  |  |  |
Carrying value of non-marketable equity securities | 14.5 |  |  | 10.7 |
Total investments in unconsolidated affiliates | $ | 18.6 |  |  | $ | 14.8 |
Non-marketable equity securities consist of investments in privately held companies without readily determinable fair values, and are reported at cost minus impairment, if any, plus or minus changes resulting from observable price changes in orderly transactions for the identical or similar investment of the same issuer. During the three and six months ended June 30, 2018, the Company recorded $1.7 million of upward adjustments to the carrying value based on observable price changes, and $1.8 million of downward adjustments due to impairment. During the three and six months ended June 30, 2018, the gross realized gains or losses from sales of available-for-sale investments were not material.

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- Definition The entire disclosure for investments in certain debt and equity securities. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 320 -URI http://asc.fasb.org/subtopic&trid=2209399 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 946 -SubTopic 320 -URI http://asc.fasb.org/subtopic&trid=2324412 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -URI http://asc.fasb.org/topic&trid=2196928 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 940 -SubTopic 320 -URI http://asc.fasb.org/subtopic&trid=2176304 + Details
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