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3. Available-for-Sale Investments (Details) - Fair Value, Measurements, Recurring [Member] - USD ($)
$ in Millions
Sep. 30, 2015
Dec. 31, 2014
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost $ 331.1 $ 334.9
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax 521.2 251.6
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax (1.2) (0.6)
Estimated Fair Value [1] 851.1 585.9
Corporate Debt Securities [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Estimated Fair Value [1] 142.0 139.9
Foreign Brokered Certificates of Deposit [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Estimated Fair Value [1]   5.2
Municipal obligations [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Estimated Fair Value [1] 5.7 6.5
Asset-backed Securities [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Estimated Fair Value [1] 45.7 48.4
Marketable Equity Securities [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Estimated Fair Value [1] 603.6 334.4
US Government Sponsored Agencies [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Estimated Fair Value [1] 50.3 47.5
Foreign Government Obligations [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Estimated Fair Value [1] 3.8 4.0
Other Long-term Investments [Member] | Asset-backed Securities [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 0.3 0.4
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax 0.0 0.0
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax 0.0 0.0
Estimated Fair Value 0.3 0.4
Other Long-term Investments [Member] | Marketable Equity Securities [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 54.5 54.5
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax 517.6 246.6
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax 0.0 0.0
Estimated Fair Value 572.1 301.1
Other Long-term Investments [Member] | Available-for-sale Securities [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 54.8 54.9
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax 517.6 246.6
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax 0.0 0.0
Estimated Fair Value 572.4 301.5
Short-term Investments [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Estimated Fair Value 278.7 284.4
Short-term Investments [Member] | Corporate Debt Securities [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 142.0 139.7
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax 0.3 0.4
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax (0.3) (0.2)
Estimated Fair Value 142.0 139.9
Short-term Investments [Member] | Foreign Brokered Certificates of Deposit [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost   5.2
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax   0.0
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax   0.0
Estimated Fair Value   5.2
Short-term Investments [Member] | Municipal obligations [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 5.7 6.5
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax 0.0 0.0
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax 0.0 0.0
Estimated Fair Value 5.7 6.5
Short-term Investments [Member] | Asset-backed Securities [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 45.5 48.2
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax 0.0 0.0
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax (0.1) (0.2)
Estimated Fair Value 45.4 48.0
Short-term Investments [Member] | Marketable Equity Securities [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 29.3 29.0
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax 3.0 4.5
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax (0.8) (0.2)
Estimated Fair Value 31.5 33.3
Short-term Investments [Member] | Available-for-sale Securities [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 276.3 280.0
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax 3.6 5.0
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax (1.2) (0.6)
Estimated Fair Value 278.7 284.4
Short-term Investments [Member] | US Government Sponsored Agencies [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 50.0 47.4
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax 0.3 0.1
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax 0.0 0.0
Estimated Fair Value 50.3 47.5
Short-term Investments [Member] | Foreign Government Obligations [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 3.8 4.0
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax 0.0 0.0
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax 0.0 0.0
Estimated Fair Value $ 3.8 $ 4.0
[1] Available-for-sale investments are included in the following accounts in the Condensed Consolidated Balance Sheets (in millions): September 30, 2015 December 31, 2014Short-term investments$278.7 $284.4Other investments572.4 301.5Total$851.1 $585.9