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3. Available-for-Sale Investments (Details) - USD ($)
$ in Millions
Jun. 30, 2020
Dec. 31, 2019
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost $ 369.1  
Debt Securities, Available-for-sale 375.5  
Fair Value, Recurring [Member]    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 369.1 $ 400.9
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax 6.6 2.4
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax (0.2) (0.4)
Debt Securities, Available-for-sale, Allowance for Credit Loss 0.0  
Debt Securities, Available-for-sale [1] 375.5 402.9
Fair Value, Recurring [Member] | Corporate Debt Securities [Member]    
Debt Securities, Available-for-sale [Line Items]    
Debt Securities, Available-for-sale [1] 173.9 204.5
Fair Value, Recurring [Member] | Municipal obligations [Member]    
Debt Securities, Available-for-sale [Line Items]    
Debt Securities, Available-for-sale [1] 14.8 11.6
Fair Value, Recurring [Member] | US Government Sponsored Agencies [Member]    
Debt Securities, Available-for-sale [Line Items]    
Debt Securities, Available-for-sale [1] 118.0 106.1
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] 61.1 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 369.0 400.8
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax 6.6 2.4
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax (0.2) (0.4)
Debt Securities, Available-for-sale, Allowance for Credit Loss 0.0  
Debt Securities, Available-for-sale [1] 375.4 402.8
Fair Value, Recurring [Member] | Short-term Investments [Member] | Corporate Debt Securities [Member]    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 171.0 203.2
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax 3.0 1.4
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 173.9 204.5
Fair Value, Recurring [Member] | Short-term Investments [Member] | Municipal obligations [Member]    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 14.6 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 14.8 11.6
Fair Value, Recurring [Member] | Short-term Investments [Member] | US Government Sponsored Agencies [Member]    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 115.2 105.6
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 118.0 106.1
Fair Value, Recurring [Member] | Short-term Investments [Member] | Foreign Government Obligations [Member]    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 5.5 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 5.6 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 60.6 72.7
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax 0.5 0.2
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax (0.1) (0.1)
Debt Securities, Available-for-sale, Allowance for Credit Loss 0.0  
Debt Securities, Available-for-sale 61.0 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):
 June 30, 2020December 31, 2019
Short-term investments$375.4  $402.8  
Other investments0.1  0.1  
Total$375.5  $402.9