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Debt - Summary of Debt (Details) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019	Nov. 21, 2019	Dec. 13, 2017	Sep. 05, 2014	Oct. 22, 2013
Debt Instrument [Line Items]
Long-term debt	$ 2,493.7	$ 2,493.1
Less current portion	0.0	0.0
Less unamortized debt issuance costs	14.3	16.3
Long-term debt	$ 2,479.4	$ 2,476.8
Weighted-average interest rate	3.77%	3.77%
Revolving Credit Facility, due August 2021 | Line of Credit
Debt Instrument [Line Items]
Long-term debt	$ 0.0	$ 0.0
Stated interest rate	0.00%	0.00%
4.50% Senior Notes, due November 2023 | Senior Notes
Debt Instrument [Line Items]
Long-term debt	$ 699.4	$ 699.2
Stated interest rate	4.50%	4.50%				4.50%
3.65% Senior Notes, due September 2024 | Senior Notes
Debt Instrument [Line Items]
Long-term debt	$ 399.5	$ 399.4
Stated interest rate	3.65%	3.65%			3.65%
3.40% Senior Notes, due December 2027 | Senior Notes
Debt Instrument [Line Items]
Long-term debt	$ 498.8	$ 498.7
Stated interest rate	3.40%	3.40%		3.40%
3.00% Senior Notes, due December 2029
Debt Instrument [Line Items]
Stated interest rate		3.00%
3.00% Senior Notes, due December 2029 | Senior Notes
Debt Instrument [Line Items]
Long-term debt	$ 499.4	$ 499.3
Stated interest rate	3.00%	3.00%	3.00%
4.05% Senior Notes, due December 2049
Debt Instrument [Line Items]
Stated interest rate		4.05%
4.05% Senior Notes, due December 2049 | Senior Notes
Debt Instrument [Line Items]
Long-term debt	$ 396.6	$ 396.5
Stated interest rate	4.05%	4.05%	4.05%
Current Portion of Long-term Debt
Debt Instrument [Line Items]
Weighted-average interest rate	0.00%	0.00%
Long-term Debt, Excluding Current Portion
Debt Instrument [Line Items]
Weighted-average interest rate	3.77%	3.77%

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

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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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