Fair Value Measurements - Narrative (Details) - Senior - USD ($)	Mar. 31, 2021	Dec. 31, 2020
$400 Million Senior Notes Due 2022
Fair Value Measurements [Line Items]
Debt instrument face amount	$ 400,000,000	$ 400,000,000
Long-term debt	216,600,000	216,600,000
$400 Million Senior Notes Due 2022 \| Level 2
Fair Value Measurements [Line Items]
Debt instrument face amount	400,000,000
Debt instrument fair value	228,800,000	232,400,000
$400 Million Senior Unsecured Notes Due 2029
Fair Value Measurements [Line Items]
Debt instrument face amount	400,000,000	400,000,000
$400 Million Senior Unsecured Notes Due 2029 \| Level 2
Fair Value Measurements [Line Items]
Debt instrument face amount	400,000,000	400,000,000
Debt instrument fair value	418,900,000	438,100,000
$450 Million Senior Unsecured Notes Due 2031
Fair Value Measurements [Line Items]
Debt instrument face amount	450,000,000	450,000,000
Debt instrument fair value	471,900,000	498,300,000
$450 Million Senior Unsecured Notes Due 2031 \| Level 2
Fair Value Measurements [Line Items]
Debt instrument face amount	$ 450,000,000	$ 450,000,000

Face (par) amount of debt instrument at time of issuance.

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Fair value portion of debt instrument payable, including, but not limited to, notes payable and loans payable.

+ References

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-Publisher FASB
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Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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