Pensions and Other Postretirement Benefits - Net Funded Status (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Amounts Recognized in the Consolidated Balance Sheets Consist of:
Pension Assets	$ 25.6	$ 19.0
Accrued Pension and Postretirement Benefits Liability — Noncurrent	(140.4)	(107.5)
Pension Benefit Plans
Change in Benefit Obligation:
Benefit Obligation at Beginning of Year	1,245.2	1,367.1
Service Cost	14.0	17.3	$ 8.2
Interest Cost	46.1	41.8	42.6
Actuarial Loss (Gain)	157.8	(101.9)
Foreign Currency Exchange	9.2	(14.8)
Settlements	(150.2)	0.0
Benefits Paid	(67.2)	(65.4)
Other	0.5	1.1
Benefit Obligation at End of Year	1,255.4	1,245.2	1,367.1
Change in Plan Assets:
Fair Value of Plan Assets at Beginning of Year	1,186.5	1,340.7
Actual Return on Plan Assets	181.7	(79.6)
Employer Contributions	11.3	5.8
Foreign Currency Exchange	10.3	(15.0)
Benefits Paid	(67.2)	(65.4)
Settlements	(150.2)	0.0
Fair Value of Plan Assets at End of Year	1,172.4	1,186.5	$ 1,340.7
Plan Assets Less than Projected Benefit Obligation	(83.0)	(58.7)
Amounts Recognized in the Consolidated Balance Sheets Consist of:
Pension Assets	25.6	19.0
Accrued Pension and Postretirement Benefits Liability — Current	(1.7)	(1.8)
Accrued Pension and Postretirement Benefits Liability — Noncurrent	(106.9)	(75.9)
Accumulated Other Comprehensive Income:
Net Actuarial Loss (Gain)	279.9	297.3
Prior Service Cost (Credit)	$ 3.6	$ 3.6
Weighted Average Calculations:
Discount Rate	2.69%	4.14%
Rates of Increase in Future Compensation Levels	2.36%	2.37%
Initial Health Care Cost Trend Rate	0.00%	0.00%
Ultimate Health Care Cost Trend Rate	0.00%	0.00%	0.00%
Posretirement Benefits
Change in Benefit Obligation:
Benefit Obligation at Beginning of Year	$ 34.1	$ 37.3
Service Cost	0.5	0.6	$ 0.8
Interest Cost	1.2	1.2	1.3
Actuarial Loss (Gain)	1.1	(3.0)
Foreign Currency Exchange	0.1	(0.2)
Settlements	0.0	0.0
Benefits Paid	(1.2)	(1.9)
Other	0.1	0.1
Benefit Obligation at End of Year	35.9	34.1	37.3
Change in Plan Assets:
Fair Value of Plan Assets at Beginning of Year	0.0	0.0
Actual Return on Plan Assets	0.0	0.0
Employer Contributions	1.2	1.9
Foreign Currency Exchange	0.0	0.0
Benefits Paid	(1.2)	(1.9)
Settlements	0.0	0.0
Fair Value of Plan Assets at End of Year	0.0	0.0	$ 0.0
Plan Assets Less than Projected Benefit Obligation	(35.9)	(34.1)
Amounts Recognized in the Consolidated Balance Sheets Consist of:
Pension Assets	0.0	0.0
Accrued Pension and Postretirement Benefits Liability — Current	(2.4)	(2.5)
Accrued Pension and Postretirement Benefits Liability — Noncurrent	(33.5)	(31.6)
Accumulated Other Comprehensive Income:
Net Actuarial Loss (Gain)	0.8	1.6
Prior Service Cost (Credit)	$ (17.3)	$ (20.2)
Weighted Average Calculations:
Discount Rate	3.22%	4.29%
Rates of Increase in Future Compensation Levels	0.00%	0.00%
Initial Health Care Cost Trend Rate	6.65%	9.00%
Ultimate Health Care Cost Trend Rate	4.50%	4.50%	4.50%