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Employee Benefits - Postretirement Plan and Summary Information for All Defined Benefit Plans (Details) - USD ($) $ in Millions	1 Months Ended	12 Months Ended
	Apr. 30, 2006	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
SERPs
Summary of benefit payments under the Company's various defined benefit plans, which reflect expected future employee service, as appropriate, expected to be paid in the future periods
2020		$ 17.5
2021		1.1
2022		10.6
2023		1.0
2024		1.0
2025-2029		4.2
Defined Benefit Plans
Summary of benefit payments under the Company's various defined benefit plans, which reflect expected future employee service, as appropriate, expected to be paid in the future periods
2020		52.0
2021		2.1
2022		2.3
2023		2.5
2024		2.7
2025-2029		$ 16.0
Supplemental Bonus Plan
Stock-Based Compensation
Number of shares of the entity to be contributed to the plan as a result of acquisition	258,006
Share liability to the plan to be settled in cash		64,362
Cash equivalent of share liability to the plan		$ 7.7
Expense (income) from mark to market adjustment		$ 3.3	$ (0.8)	$ 0.6

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Represents the number of shares of the entity to be contributed to the plan as a result of acquisition.

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Period expense (income) related to postemployment benefits.

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Amount of benefits for defined benefit plan expected to be paid in five fiscal years after fifth fiscal year following latest fiscal year.

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Amount of benefits for defined benefit plan expected to be paid in fourth fiscal year following latest fiscal year.

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For a classified balance sheet, the carrying amount as of the balance sheet date of the portion of the obligations recognized for the various benefits provided to former or inactive employees, their beneficiaries, and covered dependents after employment but before retirement that is payable after one year (or beyond the operating cycle if longer).

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