Long-Term Debt - Summary of Long-Term Debt (Details) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Debt Instrument
Outstanding principal	$ 4,632.3	$ 4,800.0
Premium (discount)	(5.9)	(5.9)
Long-term debt	4,626.4	4,794.1
Less: debt issuance cost	(32.6)	(29.8)
Less: current maturities of long-term debt	(349.8)	0.0
Long-term debt, net of unamortized issuance cost	4,244.0	4,764.3
Debt issuance cost accumulated amortization	14.1	10.9
AR Facility due 2023
Debt Instrument
Outstanding principal	250.0	0.0
Premium (discount)	0.0	0.0
Long-term debt	$ 250.0	0.0
Effective interest rate	2.00%
Credit Facility Due 2024
Debt Instrument
Outstanding principal	$ 0.0	350.0
Premium (discount)	0.0	0.0
Long-term debt	0.0	$ 350.0
Effective interest rate		3.30%
Term Loan due 2021
Debt Instrument
Outstanding principal	350.0	$ 850.0
Premium (discount)	0.0	0.0
Long-term debt	$ 350.0	$ 850.0
Effective interest rate	1.70%	3.20%
4.4% Senior Notes due 2024
Debt Instrument
Stated interest rate	4.40%
Outstanding principal	$ 521.8	$ 550.0
Premium (discount)	1.1	1.5
Long-term debt	$ 522.9	551.5
4.15% Senior Notes due 2025
Debt Instrument
Stated interest rate	4.15%
Outstanding principal	$ 720.8	750.0
Premium (discount)	(0.6)	(0.7)
Long-term debt	$ 720.2	749.3
4.85 Senior Unsecured Notes Due 2026
Debt Instrument
Stated interest rate	4.85%
Outstanding principal	$ 491.0	500.0
Premium (discount)	(0.4)	(0.5)
Long-term debt	$ 490.6	499.5
5.625% Senior unsecured notes due 2028
Debt Instrument
Stated interest rate	5.625%
Outstanding principal	$ 500.0	0.0
Premium (discount)	0.0	0.0
Long-term debt	$ 500.0	0.0
5.375% Senior unsecured notes due 2029
Debt Instrument
Stated interest rate	5.375%
Outstanding principal	$ 498.7	500.0
Premium (discount)	0.0	0.0
Long-term debt	$ 498.7	500.0
5.6% Senior Notes due 2044
Debt Instrument
Stated interest rate	5.60%
Outstanding principal	$ 350.0	350.0
Premium (discount)	(0.2)	(0.2)
Long-term debt	$ 349.8	349.8
5.05 Senior Notes due 2045
Debt Instrument
Stated interest rate	5.05%
Outstanding principal	$ 450.0	450.0
Premium (discount)	(5.7)	(5.9)
Long-term debt	$ 444.3	444.1
Senior Unsecured Notes, 5.45%, Due 2047
Debt Instrument
Stated interest rate	5.45%
Outstanding principal	$ 500.0	500.0
Premium (discount)	(0.1)	(0.1)
Long-term debt	$ 499.9	$ 499.9

Amount of long-term debt after unamortized (discount) premium and before debt issuance costs.

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Amount of accumulated amortization of debt issuance costs.

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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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Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium.

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

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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, 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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