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Fair Value Measurements - Measured on a Recurring Basis (Details) - USD ($) $ in Millions	Jun. 30, 2020	Dec. 31, 2019
Assets:
Equity securities	$ 0.1	$ 0.4
Fair Value, Measurements, Recurring
Assets:
Equity securities	0.1	0.4
Deferred compensation plan investments	1.9	1.4
Total assets	2.0	1.8
Liabilities:
Deferred compensation arrangement	11.4	10.0
Separation-related reimbursement awards	0.0	0.1
Contingent consideration	1.1
Total liabilities	12.5	10.1
Fair Value, Measurements, Recurring | Level 1
Assets:
Equity securities	0.1	0.4
Deferred compensation plan investments	1.9	1.4
Total assets	2.0	1.8
Liabilities:
Deferred compensation arrangement	11.4	10.0
Separation-related reimbursement awards	0.0	0.1
Contingent consideration	0.0
Total liabilities	11.4	10.1
Fair Value, Measurements, Recurring | Level 2
Assets:
Equity securities	0.0	0.0
Deferred compensation plan investments	0.0	0.0
Total assets	0.0	0.0
Liabilities:
Deferred compensation arrangement	0.0	0.0
Separation-related reimbursement awards	0.0	0.0
Contingent consideration	0.0
Total liabilities	0.0	0.0
Fair Value, Measurements, Recurring | Level 3
Assets:
Equity securities	0.0	0.0
Deferred compensation plan investments	0.0	0.0
Total assets	0.0	0.0
Liabilities:
Deferred compensation arrangement	0.0	0.0
Separation-related reimbursement awards	0.0	0.0
Contingent consideration	1.1
Total liabilities	$ 1.1	$ 0.0

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-Publisher FASB
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-Section 50
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Fair value portion of investment securities, including, but not limited to, marketable securities, derivative financial instruments, and investments accounted for under the equity method.

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