Pensions and Postretirement Benefits Other than Pensions (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Company contributions			$ 90.5	$ 59.3
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, after Tax	$ (1.9)	$ (12.6)	2.2	(34.5)
Pension Costs [Member]
Defined Benefit Plan, Benefit Obligation, Divestiture			488.7
Defined Benefit Plan, Plan Assets, Divestiture			351.3
Actuarial gain (loss)	(11.4)	(14.0)	(33.0)	(40.7)
Pension Plan, Defined Benefit [Member]
Expected future employer contributions in 2017	99.0		99.0
Postretirement Benefit Costs [Member]
Defined Benefit Plan, Benefit Obligation, Divestiture			29.8
Actuarial gain (loss)	$ 2.2	$ 5.0	4.3	$ 8.2
Reverse Morris Trust Transaction [Member]
Company contributions			24.4
Accumulated Defined Benefit Plans Adjustment [Member] | Pension Costs [Member]
Reclassification from AOCI, Current Period, Net of Tax, Attributable to Parent			114.2
Accumulated Defined Benefit Plans Adjustment [Member] | Postretirement Benefit Costs [Member]
Reclassification from AOCI, Current Period, Net of Tax, Attributable to Parent			$ 4.1