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Retirement Benefits (Details 6) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020
Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Noncurrent assets	$ 25.0	$ 5.4
Current liabilities	(5.7)	(5.5)
Noncurrent liabilities	(415.4)	(673.6)
Total amount recognized	(396.1)	(673.7)
Other Postretirement Benefits
Defined Benefit Plan Disclosure [Line Items]
Noncurrent assets	0.0	0.0
Current liabilities	(29.2)	(30.9)
Noncurrent liabilities	(258.1)	(326.7)
Total amount recognized	$ (287.3)	$ (357.6)

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