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INVESTMENTS - Schedule of Investments in Debt Securities (Details) - USD ($)
$ in Millions
Jun. 30, 2018
Dec. 31, 2017
Held-to-maturity    
Cost $ 48.7 $ 388.2
Gross Unrealized Gains 0.0 0.0
Gross Unrealized Losses 0.0  
Fair Value 48.7 388.2
Available-for-sale    
Cost 583.0 685.3
Gross Unrealized Gains 0.7 0.8
Gross Unrealized Losses (6.2) (2.9)
Fair Value 577.5 683.2
Bank time deposits    
Held-to-maturity    
Cost 45.7 382.9
Gross Unrealized Gains 0.0 0.0
Gross Unrealized Losses 0.0 0.0
Fair Value 45.7 382.9
Available-for-sale    
Cost 0.5 0.5
Gross Unrealized Gains 0.0 0.0
Gross Unrealized Losses 0.0 0.0
Fair Value 0.5 0.5
Commercial paper    
Held-to-maturity    
Cost 0.0 1.4
Gross Unrealized Gains 0.0 0.0
Gross Unrealized Losses 0.0 0.0
Fair Value 0.0 1.4
Available-for-sale    
Cost 18.6 40.3
Gross Unrealized Gains 0.0 0.0
Gross Unrealized Losses 0.0 0.0
Fair Value 18.6 40.3
U.S. government and agency securities    
Held-to-maturity    
Cost 3.0 3.9
Gross Unrealized Gains 0.0 0.0
Gross Unrealized Losses 0.0 0.0
Fair Value 3.0 3.9
Available-for-sale    
Cost 69.5 69.4
Gross Unrealized Gains 0.0 0.0
Gross Unrealized Losses (0.9) (0.7)
Fair Value 68.6 68.7
Foreign government bonds    
Available-for-sale    
Cost 3.0 3.0
Gross Unrealized Gains 0.0 0.0
Gross Unrealized Losses 0.0 0.0
Fair Value 3.0 3.0
Asset-backed securities    
Available-for-sale    
Cost 96.8 121.2
Gross Unrealized Gains 0.1 0.0
Gross Unrealized Losses (1.0) (0.4)
Fair Value 95.9 120.8
Corporate debt securities    
Available-for-sale    
Cost 390.2 446.5
Gross Unrealized Gains 0.6 0.8
Gross Unrealized Losses (4.3) (1.8)
Fair Value 386.5 445.5
Municipal securities    
Available-for-sale    
Cost 4.4 4.4
Gross Unrealized Gains 0.0 0.0
Gross Unrealized Losses 0.0 0.0
Fair Value $ 4.4 $ 4.4