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3. Available-for-Sale Investments (Details) - USD ($)
$ in Millions
Mar. 31, 2020
Dec. 31, 2019
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost $ 391.6  
Debt Securities, Available-for-sale 393.2  
Fair Value, Recurring [Member]    
Debt Securities, Available-for-sale [Line Items]    
Debt Securities, Available-for-sale [1] 393.2 $ 402.9
Fair Value, Recurring [Member] | Corporate Debt Securities [Member]    
Debt Securities, Available-for-sale [Line Items]    
Debt Securities, Available-for-sale [1] 198.4 204.5
Fair Value, Recurring [Member] | Municipal obligations [Member]    
Debt Securities, Available-for-sale [Line Items]    
Debt Securities, Available-for-sale [1] 14.4 11.6
Fair Value, Recurring [Member] | US Government Sponsored Agencies [Member]    
Debt Securities, Available-for-sale [Line Items]    
Debt Securities, Available-for-sale [1] 100.9 106.1
Fair Value, Recurring [Member] | Foreign Government Obligations [Member]    
Debt Securities, Available-for-sale [Line Items]    
Debt Securities, Available-for-sale [1] 5.6 4.7
Fair Value, Recurring [Member] | Foreign Government Debt [Member]    
Debt Securities, Available-for-sale [Line Items]    
Debt Securities, Available-for-sale [1] 2.1  
Fair Value, Recurring [Member] | Asset-backed Securities [Member]    
Debt Securities, Available-for-sale [Line Items]    
Debt Securities, Available-for-sale [1] 71.8 72.9
Fair Value, Recurring [Member] | Debt Securities [Member]    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 391.6 400.9
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax 4.0 2.4
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax (2.4) (0.4)
Debt Securities, Available-for-sale, Allowance for Credit Loss 0.0  
Debt Securities, Available-for-sale 393.2 402.9
Fair Value, Recurring [Member] | Other Long-term Investments [Member] | Asset-backed Securities [Member]    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 0.1 0.1
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax 0.0 0.0
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax 0.0 0.0
Debt Securities, Available-for-sale, Allowance for Credit Loss 0.0  
Debt Securities, Available-for-sale 0.1 0.1
Fair Value, Recurring [Member] | Other Long-term Investments [Member] | Debt Securities [Member]    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 0.1 0.1
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax 0.0 0.0
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax 0.0 0.0
Debt Securities, Available-for-sale, Allowance for Credit Loss 0.0  
Debt Securities, Available-for-sale 0.1 0.1
Fair Value, Recurring [Member] | Short-term Investments [Member]    
Debt Securities, Available-for-sale [Line Items]    
Debt Securities, Available-for-sale [1] 393.1 402.8
Fair Value, Recurring [Member] | Short-term Investments [Member] | Corporate Debt Securities [Member]    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 199.2 203.2
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax 0.9 1.4
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax (1.7) (0.1)
Debt Securities, Available-for-sale, Allowance for Credit Loss 0.0  
Debt Securities, Available-for-sale 198.4 204.5
Fair Value, Recurring [Member] | Short-term Investments [Member] | Municipal obligations [Member]    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 14.3 11.5
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax 0.1 0.1
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax 0.0 0.0
Debt Securities, Available-for-sale, Allowance for Credit Loss 0.0  
Debt Securities, Available-for-sale 14.4 11.6
Fair Value, Recurring [Member] | Short-term Investments [Member] | US Government Sponsored Agencies [Member]    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 98.1 105.6
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax 2.8 0.7
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax 0.0 (0.2)
Debt Securities, Available-for-sale, Allowance for Credit Loss 0.0  
Debt Securities, Available-for-sale 100.9 106.1
Fair Value, Recurring [Member] | Short-term Investments [Member] | Foreign Government Obligations [Member]    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 5.6 4.7
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
Debt Securities, Available-for-sale, Allowance for Credit Loss 0.0  
Debt Securities, Available-for-sale 5.6 4.7
Fair Value, Recurring [Member] | Short-term Investments [Member] | Foreign Government Debt [Member]    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 2.1 3.1
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax 0.0 0.0
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax 0.0 0.0
Debt Securities, Available-for-sale, Allowance for Credit Loss 0.0  
Debt Securities, Available-for-sale 2.1 3.1
Fair Value, Recurring [Member] | Short-term Investments [Member] | Asset-backed Securities [Member]    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 72.2 72.7
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax 0.2 0.2
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax (0.7) (0.1)
Debt Securities, Available-for-sale, Allowance for Credit Loss 0.0  
Debt Securities, Available-for-sale 71.7 72.8
Fair Value, Recurring [Member] | Short-term Investments [Member] | Debt Securities [Member]    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 391.5 400.8
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax 4.0 2.4
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax (2.4) (0.4)
Debt Securities, Available-for-sale, Allowance for Credit Loss 0.0  
Debt Securities, Available-for-sale 393.1 402.8
Fair Value, Recurring [Member] | Other Investments [Member]    
Debt Securities, Available-for-sale [Line Items]    
Debt Securities, Available-for-sale [1] $ 0.1 $ 0.1
[1]
Available-for-sale investments are included in the following accounts in the Condensed Consolidated Balance Sheets (in millions):
 
March 31, 2020
 
December 31, 2019
Short-term investments
$
393.1

 
$
402.8

Other investments
0.1

 
0.1

Total
$
393.2

 
$
402.9