Debt and Credit Agreements - Schedule of Long-term Debt and Credit Agreements (Details) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020
Debt Instrument [Line Items]
Net premium (discount)	$ 185.0	$ 0.0
Unamortized debt issuance costs	(9.0)	(3.0)
Long-term debt	3,125.0	1,134.0
Current portion of long-term debt	$ 0.0	188.0
6.51% weighted-average private placement senior notes
Debt Instrument [Line Items]
Weighted-average interest rate	6.51%
Long-term debt including unamortized debt issuance costs	$ 37.0	37.0
5.58% weighted-average private placement senior notes
Debt Instrument [Line Items]
Weighted-average interest rate	5.58%
Long-term debt including unamortized debt issuance costs	$ 87.0	175.0
Current portion of long-term debt		88.0
3.65% weighted-average private placement senior notes
Debt Instrument [Line Items]
Weighted-average interest rate	3.65%
Long-term debt including unamortized debt issuance costs	$ 825.0	925.0
Current portion of long-term debt		100.0
4.375% senior notes due June 1, 2024
Debt Instrument [Line Items]
Stated percentage	4.375%
Long-term debt including unamortized debt issuance costs	$ 750.0	0.0
3.90% senior notes due May 15, 2027
Debt Instrument [Line Items]
Stated percentage	3.90%
Long-term debt including unamortized debt issuance costs	$ 750.0	0.0
4.375% senior notes due March 15, 2029
Debt Instrument [Line Items]
Stated percentage	4.375%
Long-term debt including unamortized debt issuance costs	$ 500.0	0.0
Revolving credit facility
Debt Instrument [Line Items]
Long-term debt including unamortized debt issuance costs	$ 0.0	$ 0.0

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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- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Amount, after accumulated amortization, of debt discount (premium).

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

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Weighted average interest rate of long-term debt outstanding calculated at point in time.

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