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Investments in and Advances to Nonconsolidated Affiliates - Schedule of Other Long-term Assets (Details) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Equity method investments:
Capital contributions	$ 0.9	$ 0.9
Cumulative share of income	68.7	68.1
Cumulative share of distributions	(66.1)	(63.6)
Equity method investments	3.5	5.4
Measurement alternative investments:
Capital contributions, net of distributions and impairments	2.0	2.0
Total investments in and advances to nonconsolidated affiliates	$ 5.5	$ 7.4

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The Company's cumulative and proportionate receipt of distributed earnings since inception of its investment in an equity method affiliate.

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The Company's cumulative and proportionate share of income earned since inception of its investment in an equity method affiliate as of the balance sheet date.

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