Other Comprehensive Income (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Beginning Balance			$ (151.0)
Ending Balance	$ (149.0)	$ (175.0)	(149.0)	$ (175.0)
Foreign currency translation adjustments
Beginning Balance	(75.0)	(90.0)	(68.0)	(67.0)
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax	7.0	2.0	0.0	(21.0)
Ending Balance	(68.0)	(88.0)	(68.0)	(88.0)
Amortization of pension and post-retirement prior service costs and net loss
Beginning Balance	(81.0)	(88.0)	(81.0)	(89.0)
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	1.0	1.0	2.0	2.0
Ending Balance	(80.0)	(87.0)	(80.0)	(87.0)
Unrealized gain (loss) on investments
Beginning Balance	(2.0)	3.0	(2.0)	3.0
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax	0.0	(3.0)	0.0	(3.0)
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, Net of Tax	0.0	(3.0)	0.0
Ending Balance	(2.0)	0.0	(2.0)	0.0
AOCI Attributable to Parent [Member]
Beginning Balance	(157.0)	(175.0)	(151.0)	(153.0)
Ending Balance	$ (149.0)	$ (175.0)	$ (149.0)	$ (175.0)