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3. Available-for-Sale Investments (Details) (Fair Value, Measurements, Recurring [Member], USD $)
In Millions, unless otherwise specified
Sep. 30, 2014
Dec. 31, 2013
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost $ 327.2 $ 327.2
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax 228.0 244.6
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax 0.5 0.9
Estimated Fair Value 554.7 570.9
Other Long-term Investments [Member] | Asset-backed Securities [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 0.4 0.4
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax 0 0
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax 0 0.1
Estimated Fair Value 0.4 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
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax 221.8 238.7
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax 0 0
Estimated Fair Value 276.3 293.2
Other Long-term Investments [Member] | Available-for-sale Securities [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 54.9 54.9
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax 221.8 238.7
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax 0 0.1
Estimated Fair Value 276.7 293.5
Short-term Investments [Member] | Corporate Debt Securities [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 132.3 132.6
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax 0.4 0.3
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax 0.1 0.4
Estimated Fair Value 132.6 132.5
Short-term Investments [Member] | Foreign Brokered Certificates of Deposit [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 5.2 8.9
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 8.9
Short-term Investments [Member] | Municipal obligations [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 7.9 11.1
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax 0 0
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax 0.1 0.1
Estimated Fair Value 7.8 11.0
Short-term Investments [Member] | Asset-backed Securities [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 49.8 48.4
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax 0 0.1
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax 0.1 0.2
Estimated Fair Value 49.7 48.3
Short-term Investments [Member] | Marketable Equity Securities [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 26.7 26.6
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax 5.7 5.4
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax 0.1 0
Estimated Fair Value 32.3 32.0
Short-term Investments [Member] | Available-for-sale Securities [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 272.3 272.3
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax 6.2 5.9
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax 0.5 0.8
Estimated Fair Value 278.0 277.4
Short-term Investments [Member] | US Government Sponsored Agencies [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 46.0 39.1
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax 0.1 0.1
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax 0.1 0.1
Estimated Fair Value 46.0 39.1
Short-term Investments [Member] | Foreign Government Obligations [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 4.4 5.6
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 4.4 5.6
Estimate of Fair Value, Fair Value Disclosure [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Estimated Fair Value 554.7 [1] 570.9 [1]
Estimate of Fair Value, Fair Value Disclosure [Member] | Corporate Debt Securities [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Estimated Fair Value 132.6 [1] 132.5 [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 5.2 [1] 8.9 [1]
Estimate of Fair Value, Fair Value Disclosure [Member] | Municipal obligations [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Estimated Fair Value 7.8 [1] 11.0 [1]
Estimate of Fair Value, Fair Value Disclosure [Member] | Asset-backed Securities [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Estimated Fair Value 50.1 [1] 48.6 [1]
Estimate of Fair Value, Fair Value Disclosure [Member] | Marketable Equity Securities [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Estimated Fair Value 308.6 [1] 325.2 [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 46.0 [1] 39.1 [1]
Estimate of Fair Value, Fair Value Disclosure [Member] | Foreign Government Obligations [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Estimated Fair Value 4.4 [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 $ 278.0 $ 277.4
[1] Available-for-sale investments are included in the following accounts in the Condensed Consolidated Balance Sheets (in millions): September 30, 2014 December 31, 2013Short-term investments$278.0 $277.4Other investments276.7 293.5Total$554.7 $570.9