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Fair value portion of notes payable.

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Long-term Debt Narrative (Details) - USD ($) $ in Millions	1 Months Ended	12 Months Ended
Long-term Debt Narrative (Details) - USD ($) $ in Millions	Jun. 30, 2020	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	May 31, 2020
Debt Instrument [Line Items]
Amortization of financing costs and discounts		$ 2.0	$ 2.0	$ 1.0
Long-term Debt, Gross		351.0	$ 351.0
Debt, weighted average interest rate			4.90%
Line of Credit Facility, Maximum Borrowing Capacity		200.0			$ 550.0
Proceeds from Lines of Credit		350.0
Payment for Debt Extinguishment or Debt Prepayment Cost	$ 350.0
Senior unsecured notes, maturing 2024
Debt Instrument [Line Items]
Fair value of debt		360.0	$ 362.0
Amount of loan issuance		350.0
Long-term Debt, Gross		$ 350.0	$ 350.0
Debt, interest rate, stated percentage		4.875%
Senior unsecured notes, maturing 2024 \| Amended Credit Facility \| Line of Credit
Debt Instrument [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity		$ 550.0
Senior unsecured notes, maturing 2024 \| Letter of Credit \| Line of Credit
Debt Instrument [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity		$ 60.0
Base Rate \| Minimum \| Revolving A Loans \| Amended Credit Facility
Debt Instrument [Line Items]
Debt instrument, basis spread on variable rate		0.875%
Base Rate \| Minimum \| Revolving B Loans \| Amended Credit Facility
Debt Instrument [Line Items]
Debt instrument, basis spread on variable rate		1.125%
Base Rate \| Maximum \| Revolving A Loans \| Amended Credit Facility
Debt Instrument [Line Items]
Debt instrument, basis spread on variable rate		2.00%
Base Rate \| Maximum \| Revolving B Loans \| Amended Credit Facility
Debt Instrument [Line Items]
Debt instrument, basis spread on variable rate		2.25%
London Interbank Offered Rate (LIBOR) \| Minimum \| Revolving A Loans \| Amended Credit Facility
Debt Instrument [Line Items]
Debt instrument, basis spread on variable rate		1.875%
London Interbank Offered Rate (LIBOR) \| Minimum \| Revolving B Loans \| Amended Credit Facility
Debt Instrument [Line Items]
Debt instrument, basis spread on variable rate		2.125%
London Interbank Offered Rate (LIBOR) \| Maximum \| Revolving A Loans \| Amended Credit Facility
Debt Instrument [Line Items]
Debt instrument, basis spread on variable rate		3.00%
London Interbank Offered Rate (LIBOR) \| Maximum \| Revolving B Loans \| Amended Credit Facility
Debt Instrument [Line Items]
Debt instrument, basis spread on variable rate		3.25%