Debt - Components (Details) - USD ($) $ in Millions	Sep. 30, 2021	Dec. 31, 2020
Debt
Unamortized debt issuance costs	$ (2.1)	$ (2.4)
Total debt	827.0	844.5
Current portion of long-term debt	(109.5)	(2.2)
Total long-term debt, less current portion	717.5	842.3
2012 Note Purchase Agreement
Debt
Debt, before unamortized debt issuance costs	205.0	205.0
2019 Note Purchase Agreement
Debt
Debt, before unamortized debt issuance costs	318.1	335.5
2019 Term Loan
Debt
Debt, before unamortized debt issuance costs	300.0	300.0
Finance lease obligations and other loans
Debt
Total debt	$ 6.0	$ 6.4

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 accumulated amortization, of debt issuance costs. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs.

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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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Amount of long-term debt and lease obligation, classified as current.

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Amount after unamortized (discount) premium and debt issuance costs of long-term debt classified as noncurrent and excluding amounts to be repaid within one year or the normal operating cycle, if longer. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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