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3. Available-for-Sale Investments (Details) - Fair Value, Measurements, Recurring [Member] - USD ($)
$ in Millions
Sep. 30, 2017
Dec. 31, 2016
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost $ 434.1 $ 435.7
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax 886.5 681.7
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax (0.8) (1.8)
Estimated Fair Value [1] 1,319.8 1,115.6
Corporate Debt Securities [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Estimated Fair Value [1] 200.6 179.4
Brokered certificates of deposit [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Estimated Fair Value [1]   3.6
Municipal obligations [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Estimated Fair Value [1] 14.3 15.4
Asset-backed Securities [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Estimated Fair Value [1] 57.8 62.5
Marketable Equity Securities [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Estimated Fair Value [1] 973.2 767.8
US Government Sponsored Agencies [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Estimated Fair Value [1] 70.9 82.5
Foreign Government Obligations [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Estimated Fair Value [1] 3.0 4.4
Other Long-term Investments [Member] | Asset-backed Securities [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 0.2 0.3
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 0.2 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 877.6 677.6
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax 0.0 0.0
Estimated Fair Value 932.1 732.1
Other Long-term Investments [Member] | Available-for-sale Securities [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 54.7 54.8
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax 877.6 677.6
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax 0.0 0.0
Estimated Fair Value 932.3 732.4
Short-term Investments [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Estimated Fair Value 387.5 383.2
Short-term Investments [Member] | Corporate Debt Securities [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 200.3 179.7
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax 0.5 0.2
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax (0.2) (0.5)
Estimated Fair Value 200.6 179.4
Short-term Investments [Member] | Brokered certificates of deposit [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost   3.6
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   3.6
Short-term Investments [Member] | Municipal obligations [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 14.4 15.5
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax 0.0 0.0
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax (0.1) (0.1)
Estimated Fair Value 14.3 15.4
Short-term Investments [Member] | Asset-backed Securities [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 57.7 62.2
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax 0.0 0.1
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax (0.1) (0.1)
Estimated Fair Value 57.6 62.2
Short-term Investments [Member] | Marketable Equity Securities [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 32.8 32.4
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax 8.3 3.7
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax 0.0 (0.4)
Estimated Fair Value 41.1 35.7
Short-term Investments [Member] | Available-for-sale Securities [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 379.4 380.9
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax 8.9 4.1
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax (0.8) (1.8)
Estimated Fair Value 387.5 383.2
Short-term Investments [Member] | US Government Sponsored Agencies [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 71.2 83.1
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax 0.1 0.1
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax (0.4) (0.7)
Estimated Fair Value 70.9 82.5
Short-term Investments [Member] | Foreign Government Obligations [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 3.0 4.4
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 $ 3.0 $ 4.4
[1] Available-for-sale investments are included in the following accounts in the Condensed Consolidated Balance Sheets (in millions):
 
September 30,
2017
 
December 31, 2016
Short-term investments
$
387.5

 
$
383.2

Other investments
932.3

 
732.4

Total
$
1,319.8

 
$
1,115.6