Pensions and Postretirement Benefits Other Than Pensions (Narrative) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Defined benefit plan, fair value of pension plan assets	$ 3,136.8	$ 2,766.9
Percent of our projected benefit obligation relates to plans that cannot be funded	7.00%
Accumulated benefit obligation for all defined benefit pension plans	$ 3,734.5	3,364.6
Projected benefit obligation	3,405.7	3,075.2
Accumulated benefit obligation	3,308.2	2,992.0
Fair value of plan assets	2,645.1	2,330.4
Multiemployer plan, period contributions	10.4	9.8	$ 9.0
Net of Medicare Part D subsidy	0.8	0.9
Net periodic benefit cost after net curtailment and settlement (gains) losses	(39.3)	(21.9)	(31.0)
Postretirement Benefit Costs [Member]
Defined Benefit Plan, Amortization of Prior Service Cost (Credit)	(0.3)	(3.8)	(8.6)
Postretirement benefit cost	8.0
Plan net actuarial gains (losses)	(10.9)	(1.0)	0.1
Net periodic benefit cost after net curtailment and settlement (gains) losses	$ 6.2	$ 12.4	10.3
Pension Plans [Member]
Discount rate	3.22%	4.21%
Defined Benefit Plan, Amortization of Prior Service Cost (Credit)	$ 5.0	$ 4.2	3.8
Projected pension expenses for 2013	89.0
Projected prior service cost for 2013	5.0
Projected net actuarial losses for 2013	47.0
Company contributions	140.2	131.9	118.7
Projected company contributions in 2013	90.0
Plan net actuarial gains (losses)	54.3	51.3	56.8
Net periodic benefit cost after net curtailment and settlement (gains) losses	$ 118.0	$ 95.9	$ 104.3
Postretirement [Member]
Discount rate	2.99%	4.05%	3.38%
Plan net actuarial gains (losses)	$ (6.7)	$ 60.4
Change In Plan Assets [Member] | Pension Plans [Member]
Defined benefit plan, fair value of pension plan assets	3,136.8	2,766.9	$ 3,063.1
Company contributions	83.1	86.9	101.4
Fair Value, Inputs, Level 1 [Member]
Defined benefit plan, fair value of pension plan assets	7.0	4.0
Fixed Income Investments [Member]
Defined benefit plan, fair value of pension plan assets	2,249.7	2,046.9
Fixed Income Investments [Member] | Fair Value, Inputs, Level 1 [Member]
Defined benefit plan, fair value of pension plan assets	$ 0.0	$ 0.0
Non-U.S. plans [Member] | Pension Plans [Member]
Discount rate	1.66%	2.47%
Non-U.S. plans [Member] | Defined Contribution and Other Benefit Plans [Member]
Company contributions	$ 56.7	$ 52.0	$ 47.7