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Employee Benefit Plans - Amounts Recognized in the Balance Sheet (Details) - USD ($) $ in Millions	Dec. 31, 2019	Dec. 31, 2018
Pension Plan [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Noncurrent assets	$ 21.2	$ 26.4
Defined benefit pension plan liabilities, current	(6.6)	(6.5)
Defined benefit pension plan, liabilities, noncurrent	(118.2)	(128.6)
Defined benefit plan, amounts recognized in balance sheet	(103.6)	(108.7)
Other Postretirement Benefits Plan [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Noncurrent assets	0.0	0.0
Postemployment benefits liability, current	(29.1)	(30.8)
Other postretirement defined benefit plan, liabilities, noncurrent	(520.0)	(506.5)
Other postretirement defined benefit plan, liabilities	$ (549.1)	$ (537.3)

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Amount of liability, recognized in statement of financial position, for defined benefit pension plan, classified as current. Excludes other postretirement benefit plan.

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Amount of liability, recognized in statement of financial position, for defined benefit pension plan, classified as noncurrent. Excludes other postretirement benefit plan.

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Amount of asset, recognized in statement of financial position, for overfunded defined benefit pension and other postretirement plans.

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