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3. Available-for-Sale Investments (Details) (Fair Value, Measurements, Recurring [Member], USD $)
In Millions, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2013
Dec. 31, 2012
Schedule of Available-for-sale Securities [Line Items]      
Amortized Cost $ 320.6 $ 320.6 $ 510.4
Unrealized Gains 224.4 165.9  
Unrealized Losses (0.9) (0.6)  
Estimated Fair Value 544.1 544.1 675.7
Other Long-term Investments [Member] | Asset-backed Securities [Member]
      
Schedule of Available-for-sale Securities [Line Items]      
Amortized Cost 0.4 0.4 0.4
Unrealized Gains 0 0  
Unrealized Losses (0.1) (0.1)  
Estimated Fair Value 0.3 0.3 0.3
Other Long-term Investments [Member] | Marketable Equity Securities [Member]
      
Schedule of Available-for-sale Securities [Line Items]      
Amortized Cost 54.5 54.5 54.5
Unrealized Gains 219.3 163.0  
Unrealized Losses 0 0  
Estimated Fair Value 273.8 273.8 217.5
Other Long-term Investments [Member] | Available-for-sale Securities [Member]
      
Schedule of Available-for-sale Securities [Line Items]      
Amortized Cost 54.9 54.9 55.1
Unrealized Gains 219.3 163.0  
Unrealized Losses (0.1) (0.1)  
Estimated Fair Value 274.1 274.1 218.0
Other Long-term Investments [Member] | Foreign Government Obligations [Member]
      
Schedule of Available-for-sale Securities [Line Items]      
Amortized Cost     0.2
Unrealized Gains   0  
Unrealized Losses   0  
Estimated Fair Value     0.2
Short-term Investments [Member] | Corporate Debt Securities [Member]
      
Schedule of Available-for-sale Securities [Line Items]      
Amortized Cost 120.4 120.4 239.3
Unrealized Gains 0.3 1.4  
Unrealized Losses (0.4) (0.1)  
Estimated Fair Value 120.3 120.3 240.6
Short-term Investments [Member] | Foreign Brokered Certificates of Deposit [Member]
      
Schedule of Available-for-sale Securities [Line Items]      
Amortized Cost 8.9 8.9 0.4
Unrealized Gains 0 0  
Unrealized Losses 0 0  
Estimated Fair Value 8.9 8.9 0.4
Short-term Investments [Member] | Municipal obligations [Member]
      
Schedule of Available-for-sale Securities [Line Items]      
Amortized Cost 10.7 10.7 12.0
Unrealized Gains 0 0.1  
Unrealized Losses (0.1) 0  
Estimated Fair Value 10.6 10.6 12.1
Short-term Investments [Member] | Asset-backed Securities [Member]
      
Schedule of Available-for-sale Securities [Line Items]      
Amortized Cost 51.5 51.5 81.6
Unrealized Gains 0 0.4  
Unrealized Losses (0.2) (0.1)  
Estimated Fair Value 51.3 51.3 81.9
Short-term Investments [Member] | Marketable Equity Securities [Member]
      
Schedule of Available-for-sale Securities [Line Items]      
Amortized Cost 25.1 25.1 24.1
Unrealized Gains 4.7 0.7  
Unrealized Losses (0.1) (0.2)  
Estimated Fair Value 29.7 29.7 24.6
Short-term Investments [Member] | Available-for-sale Securities [Member]
      
Schedule of Available-for-sale Securities [Line Items]      
Amortized Cost 265.7 265.7 455.3
Unrealized Gains 5.1 2.9  
Unrealized Losses (0.8) (0.5)  
Estimated Fair Value 270.0 270.0 457.7
Short-term Investments [Member] | US Government Sponsored Agencies [Member]
      
Schedule of Available-for-sale Securities [Line Items]      
Amortized Cost 42.2 42.2 92.5
Unrealized Gains 0.1 0.3  
Unrealized Losses 0 (0.1)  
Estimated Fair Value 42.3 42.3 92.7
Short-term Investments [Member] | Foreign Government Obligations [Member]
      
Schedule of Available-for-sale Securities [Line Items]      
Amortized Cost 6.9 6.9 5.4
Unrealized Gains 0 0  
Unrealized Losses 0 0  
Estimated Fair Value 6.9 6.9 5.4
Estimate of Fair Value, Fair Value Disclosure [Member]
      
Schedule of Available-for-sale Securities [Line Items]      
Estimated Fair Value 544.1 [1] 544.1 [1] 675.7 [1]
Estimate of Fair Value, Fair Value Disclosure [Member] | Corporate Debt Securities [Member]
      
Schedule of Available-for-sale Securities [Line Items]      
Estimated Fair Value 120.3 [1] 120.3 [1] 240.6 [1]
Estimate of Fair Value, Fair Value Disclosure [Member] | Foreign Brokered Certificates of Deposit [Member]
      
Schedule of Available-for-sale Securities [Line Items]      
Estimated Fair Value 8.9 [1] 8.9 [1] 0.4 [1]
Estimate of Fair Value, Fair Value Disclosure [Member] | Municipal obligations [Member]
      
Schedule of Available-for-sale Securities [Line Items]      
Estimated Fair Value 10.6 [1] 10.6 [1] 12.1 [1]
Estimate of Fair Value, Fair Value Disclosure [Member] | Asset-backed Securities [Member]
      
Schedule of Available-for-sale Securities [Line Items]      
Estimated Fair Value 51.6 [1] 51.6 [1] 82.2 [1]
Estimate of Fair Value, Fair Value Disclosure [Member] | Marketable Equity Securities [Member]
      
Schedule of Available-for-sale Securities [Line Items]      
Estimated Fair Value 303.5 [1] 303.5 [1] 242.1 [1]
Estimate of Fair Value, Fair Value Disclosure [Member] | US Government Sponsored Agencies [Member]
      
Schedule of Available-for-sale Securities [Line Items]      
Estimated Fair Value 42.3 [1] 42.3 [1] 92.7 [1]
Estimate of Fair Value, Fair Value Disclosure [Member] | Foreign Government Obligations [Member]
      
Schedule of Available-for-sale Securities [Line Items]      
Estimated Fair Value 6.9 [1] 6.9 [1] 5.6 [1]
Estimate of Fair Value, Fair Value Disclosure [Member] | Short-term Investments [Member]
      
Schedule of Available-for-sale Securities [Line Items]      
Estimated Fair Value $ 270.0 $ 270.0 $ 457.7
[1] Available-for-sale investments are included in the following accounts in the Condensed Consolidated Balance Sheets (in millions): September 30, 2013 December 31, 2012Short-term investments$270.0 $457.7Other investments274.1 218.0Total$544.1 $675.7