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2. Available-for-Sale Investments (Details) - Fair Value, Measurements, Recurring [Member] - USD ($)
$ in Millions
Mar. 31, 2018
Dec. 31, 2017
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost $ 315.1 $ 418.1
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax 0.1 884.8
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax (2.9) (1.5)
Estimated Fair Value [1] 312.3 1,301.4
Corporate Debt Securities [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Estimated Fair Value [1] 172.9 185.7
Brokered certificates of deposit [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Estimated Fair Value [1]   0.7
Municipal obligations [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Estimated Fair Value [1] 15.2 15.0
Asset-backed Securities [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Estimated Fair Value [1] 55.2 55.6
Marketable Equity Securities [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Estimated Fair Value [1]   973.4
US Government Sponsored Agencies [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Estimated Fair Value [1] 65.2 67.6
Foreign Government Obligations [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Estimated Fair Value [1] 3.8 3.4
Other Long-term Investments [Member] | Asset-backed Securities [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 0.2 0.2
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax 0.0 0.0
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax 0.0 0.0
Estimated Fair Value 0.2 0.2
Other Long-term Investments [Member] | Marketable Equity Securities [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost   54.5
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax   875.5
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax   0.0
Estimated Fair Value   930.0
Other Long-term Investments [Member] | Available-for-sale Securities [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 0.2 54.7
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax 0.0 875.5
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax 0.0 0.0
Estimated Fair Value 0.2 930.2
Short-term Investments [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Estimated Fair Value 312.1 371.2
Short-term Investments [Member] | Corporate Debt Securities [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 174.1 185.9
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax 0.1 0.3
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax (1.3) (0.5)
Estimated Fair Value 172.9 185.7
Short-term Investments [Member] | Brokered certificates of deposit [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost   0.7
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   0.7
Short-term Investments [Member] | Municipal obligations [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 15.3 15.1
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 15.2 15.0
Short-term Investments [Member] | Asset-backed Securities [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 55.4 55.6
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax 0.0 0.0
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax (0.4) (0.2)
Estimated Fair Value 55.0 55.4
Short-term Investments [Member] | Marketable Equity Securities [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost   34.4
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax   9.0
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax   0.0
Estimated Fair Value   43.4
Short-term Investments [Member] | Available-for-sale Securities [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 314.9 363.4
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax 0.1 9.3
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax (2.9) (1.5)
Estimated Fair Value 312.1 371.2
Short-term Investments [Member] | US Government Sponsored Agencies [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 66.3 68.3
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax 0.0 0.0
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax (1.1) (0.7)
Estimated Fair Value 65.2 67.6
Short-term Investments [Member] | Foreign Government Obligations [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 3.8 3.4
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 $ 3.8 $ 3.4
[1] Available-for-sale investments are included in the following accounts in the Condensed Consolidated Balance Sheets (in millions):
 
March 31, 2018
 
December 31, 2017
Short-term investments
$
312.1

 
$
371.2

Other investments
0.2

 
930.2

Total
$
312.3

 
$
1,301.4