Pension And Other Benefit Programs (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Sep. 30, 2017	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2007
U.S. Defined-Benefit Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Actuarial gain (loss) amortization period		19 years	8 years
Amortization of unrecognized net actuarial gains (losses) in 2018		$ (20.1)
Estimated future employer contributions in 2018		4.0
U.S. Defined-Benefit Plans [Member] | Cost Of Goods Sold [Member]
Defined Benefit Plan Disclosure [Line Items]
Partial settlement losses	$ 12.5
U.S. Defined-Benefit Plans [Member] | SG&A Expenses [Member]
Defined Benefit Plan Disclosure [Line Items]
Partial settlement losses	$ 8.3
Defined Benefit Pension Plans [Member] | Minimum [Member]
Defined Benefit Plan Disclosure [Line Items]
Assumed rate of return forecast period					10 years
Defined Benefit Pension Plans [Member] | Maximum [Member]
Defined Benefit Plan Disclosure [Line Items]
Assumed rate of return forecast period					30 years
U.S. Pension Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Partial settlement losses		$ (20.8)
Long-term return forecast		6.50%	6.75%
Accumulated benefit obligation		$ 1,496.4	$ 1,518.0
Non-U.S. Pension Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Accumulated benefit obligation		2.7	2.5
Amortization of unrecognized net actuarial gains (losses) in 2018		0.0
Estimated future employer contributions in 2018		$ 0.0
U.S. Defined-Benefit Retiree Health And Life Insurance Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Average rate of annual increase in the per capita costs, pre-65		8.00%
Ultimate rate		4.50%
Amortization of unrecognized net actuarial gains (losses) in 2018		$ 5.3
Estimated future employer contributions in 2018		$ 7.4
U.S. Defined-Benefit Retiree Health And Life Insurance Plans [Member] | Minimum [Member]
Defined Benefit Plan Disclosure [Line Items]
Average rate of annual increase in the per capita costs, post-65		9.20%
U.S. Defined-Benefit Retiree Health And Life Insurance Plans [Member] | Maximum [Member]
Defined Benefit Plan Disclosure [Line Items]
Average rate of annual increase in the per capita costs, post-65		10.90%
U.S. and Non-U.S. Plans [Member] | Defined Contribution Benefit Plans [member]
Defined Benefit Plan Disclosure [Line Items]
Employee contributions, vested percentage		100.00%
Costs for worldwide defined contribution benefit plans		$ 6.2	$ 5.6	$ 5.7