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INVESTMENTS (Tables) | 6 Months Ended
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Jun. 30, 2018
Investments, Debt and Equity Securities [Abstract] |
Schedule of Investments in 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 |
Schedule of Cost and Fair Value of Investments in Debt Securities, By Contractual Maturity | 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 |
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value | 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 | )
Schedule of Investments in Unconsolidated Affiliates | 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 |

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- Definition Tabular disclosure of fair value amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in unrealized loss position. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27290-111563 + Details
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- Definition The entire disclosure for the information summarizing investments in and advances to majority-owned subsidiaries, other controlled companies, and other affiliates. It reflects specified information about ownership, financial results from, and financial position in such entities. + References Reference 1: 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 + Details
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