Debt - Future Maturities of Long-Term Debt (Details) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020
Future maturities of long-term debt
Year 1: Long-term debt maturities	$ 301.8
Year 2: Long-term debt maturities	324.2
Year 3: Long-term debt maturities	17.5
Year 4: Long-term debt maturities	398.7
Year 5: Long-term debt maturities	354.7
Year 6 and thereafter: Long-term debt maturities	2,883.3
Long-term debt carrying amount	$ 4,280.2	$ 4,279.2

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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Amount of long-term debt payable, sinking fund requirement, and other securities issued that are redeemable by holder at fixed or determinable price and date, maturing in next fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

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Amount of long-term debt payable, sinking fund requirement, and other securities issued that are redeemable by holder at fixed or determinable price and date, maturing in fourth fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

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