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Summary of Significant Accounting Policies - Fair Value (Details) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020
Fair Values of Financial Instruments
Total carrying value of debt	$ 1,662.4	$ 1,663.7
Senior Unsecured Notes - Publicly Traded
Fair Values of Financial Instruments
Carrying value, before deducting unamortized discount or premiums	1,650.0	1,650.0
Carrying value	1,640.0	1,640.0
Senior Unsecured Notes - Publicly Traded | Level 2
Fair Values of Financial Instruments
Fair value	$ 1,750.0	$ 1,800.0

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- Definition

Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

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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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