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3. Available-for-Sale Investments (Details) - USD ($)
$ in Millions
Sep. 30, 2020
Dec. 31, 2019
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost $ 255.2  
Debt Securities, Available-for-sale 261.3  
Fair Value, Recurring [Member]    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 255.2 $ 400.9
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax 6.2 2.4
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax (0.1) (0.4)
Debt Securities, Available-for-sale, Allowance for Credit Loss 0.0  
Debt Securities, Available-for-sale [1] 261.3 402.9
Fair Value, Recurring [Member] | Corporate Debt Securities [Member]    
Debt Securities, Available-for-sale [Line Items]    
Debt Securities, Available-for-sale [1] 114.4 204.5
Fair Value, Recurring [Member] | Municipal obligations [Member]    
Debt Securities, Available-for-sale [Line Items]    
Debt Securities, Available-for-sale [1] 13.4 11.6
Fair Value, Recurring [Member] | US Government Sponsored Agencies [Member]    
Debt Securities, Available-for-sale [Line Items]    
Debt Securities, Available-for-sale [1] 78.2 106.1
Fair Value, Recurring [Member] | Foreign Government Obligations [Member]    
Debt Securities, Available-for-sale [Line Items]    
Debt Securities, Available-for-sale [1] 5.0 4.7
Fair Value, Recurring [Member] | Foreign Government Debt [Member]    
Debt Securities, Available-for-sale [Line Items]    
Debt Securities, Available-for-sale 2.1 [1] 3.1
Fair Value, Recurring [Member] | Asset-backed Securities [Member]    
Debt Securities, Available-for-sale [Line Items]    
Debt Securities, Available-for-sale [1] 48.2 72.9
Fair Value, Recurring [Member] | Other Long-term Investments [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] | 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] | Short-term Investments [Member]    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 255.1 400.8
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax 6.2 2.4
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax (0.1) (0.4)
Debt Securities, Available-for-sale, Allowance for Credit Loss 0.0  
Debt Securities, Available-for-sale [1] 261.2 402.8
Fair Value, Recurring [Member] | Short-term Investments [Member] | Corporate Debt Securities [Member]    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 111.5 203.2
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax 2.9 1.4
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax 0.0 (0.1)
Debt Securities, Available-for-sale, Allowance for Credit Loss 0.0  
Debt Securities, Available-for-sale 114.4 204.5
Fair Value, Recurring [Member] | Short-term Investments [Member] | Municipal obligations [Member]    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 13.2 11.5
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax 0.2 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 13.4 11.6
Fair Value, Recurring [Member] | Short-term Investments [Member] | US Government Sponsored Agencies [Member]    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 75.6 105.6
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax 2.6 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 78.2 106.1
Fair Value, Recurring [Member] | Short-term Investments [Member] | Foreign Government Obligations [Member]    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 4.9 4.7
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax 0.1 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 5.0 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 47.8 72.7
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax 0.4 0.2
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax (0.1) (0.1)
Debt Securities, Available-for-sale, Allowance for Credit Loss 0.0  
Debt Securities, Available-for-sale 48.1 72.8
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):
 September 30, 2020December 31, 2019
Short-term investments$261.2 $402.8 
Other investments0.1 0.1 
Total$261.3 $402.9