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Employee Benefit Plans Amounts Recognized in the Balance Sheet (Details) - USD ($) $ in Millions	Dec. 31, 2017	Dec. 31, 2016
Pension Plan [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Noncurrent assets	$ 18.9	$ 12.9
Defined benefit pension plan liabilities, current	(6.0)	(5.7)
Defined benefit pension plan, liabilities, noncurrent	(134.7)	(113.5)
Defined benefit plan, amounts recognized in balance sheet	(121.8)	(106.3)
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	(30.3)	(29.1)
Other postretirement defined benefit plan, liabilities, noncurrent	(583.0)	(542.6)
Other postretirement defined benefit plan, liabilities	$ (613.3)	$ (571.7)

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- Definition

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

+ References

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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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