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3. Fair Value and Gross Unrealized Losses with Unrealized Losses (Details) - USD ($)
$ in Millions
 6 Months Ended
Jun. 30, 2015
Dec. 31, 2014
Tolerable variance Level 2 debt security pricing 1.00%  
Fair Value of Investments with Gross Unrealized Losses in loss position 12 months or more $ 7.2 $ 8.4
Cost Method Investment, Percentage Owned 35.00%  
Fair Value of Investments with Gross Unrealized Losses in loss position less than 12 months $ 74.6 90.7
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 0.1 0.2
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss $ 0.5 $ 0.4