Postretirement Benefit Plans - Narrative (Details) - USD ($)	3 Months Ended			12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Dec. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Defined Benefit Plan, Plan Assets, Contributions by Employer				$ 35,400,000	$ 11,300,000	$ 11,500,000
Defined Benefit Plan, Actuarial Gain (Loss), Immediate Recognition as Component in Net Periodic Benefit (Cost) Credit	$ (21,100,000)	$ (16,900,000)	$ (19,700,000)	4,100,000	(12,800,000)	(18,100,000)
Postretirement Benefit Plans (Textual) [Abstract]
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Settlement and Curtailment			10,200,000
Pension Plan [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Defined Benefit Plan, Plan Assets, Contributions by Employer				35,400,000	11,300,000
Defined Benefit Plan, Actuarial Gain (Loss), Immediate Recognition as Component in Net Periodic Benefit (Cost) Credit				(13,900,000)	(38,800,000)	23,200,000
Current liabilities	6,900,000		28,900,000	6,900,000	28,900,000
Postretirement Benefit Plans [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Defined Benefit Plan, Plan Assets, Contributions by Employer				8,000,000.0	7,400,000
Defined Benefit Plan, Benefit Obligation, Increase (Decrease) for Plan Amendment				92,800,000	4,400,000
Defined Benefit Plan, Actuarial Gain (Loss), Immediate Recognition as Component in Net Periodic Benefit (Cost) Credit				18,000,000.0	16,700,000	$ 4,000,000.0
Current liabilities	$ 3,800,000		$ 5,900,000	3,800,000	$ 5,900,000
Postretirement Benefit Plans (Textual) [Abstract]
Discount rate related to the postretirement plans					3.57%	3.97%
Effect of one percentage point increase on service and interest cost components				100,000
Effect of one percentage point increase on accumulated postretirement benefit obligation				2,400,000
Effect of one percentage point decrease on service and interest cost components				(100,000)
Effect of one percentage point decrease on accumulated postretirement benefit obligation				$ (2,000,000.0)
Discount rate	3.43%		4.30%	3.43%	4.30%	3.57%	3.97%
Expected long-term return on plan assets				4.85%	4.50%	6.00%
Weighted Average Annual Rate of Increase in Per Capita Cost for Medical Benefits				5.80%
Weighted Average Annual Rate of Increase in Per Capita Cost for Medical Benefits Declining Gradually				5.00%
Prescription Drug Benefits [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Health Care Cost Trend Rate Year					2023
Health Maintenance Organization (HMO) [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Weighted Average Annual Rate of Increase in Per Capita for Prescription Drug Benefits and HMO Benefits Declining				5.00%
Health Care Cost Trend Rate Year					2031
Maximum [Member] | Postretirement Benefit Plans [Member]
Postretirement Benefit Plans (Textual) [Abstract]
Discount rate related to the postretirement plans				4.30%
Minimum [Member] | Postretirement Benefit Plans [Member]
Postretirement Benefit Plans (Textual) [Abstract]
Discount rate related to the postretirement plans				3.48%
Forecast [Member] | Postretirement Benefit Plans [Member]
Postretirement Benefit Plans (Textual) [Abstract]
Discount rate related to the postretirement plans				3.43%
Expected amortization of prior service cost	$ 9,800,000			$ 9,800,000
Expected long-term return on plan assets				3.00%
United States [Member] | Pension Plan [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Defined Benefit Plan, Plan Assets, Contributions by Employer				$ 28,700,000	$ 5,300,000
Defined Benefit Plan, Benefit Obligation, Increase (Decrease) for Plan Amendment				0	0
Defined Benefit Plan, Actuarial Gain (Loss), Immediate Recognition as Component in Net Periodic Benefit (Cost) Credit				3,500,000	(30,000,000.0)	$ (23,100,000)
Current liabilities	$ 5,400,000		$ 27,400,000	$ 5,400,000	$ 27,400,000
Postretirement Benefit Plans (Textual) [Abstract]
Discount rate related to the postretirement plans				4.36%
Discount rate	3.50%		4.36%	3.50%	4.36%	3.80%	4.34%
Expected long-term return on plan assets				6.12%
Deferred Compensation Arrangement with Individual, Compensation Expense				$ 24,000,000
United States [Member] | Maximum [Member] | Pension Plan [Member]
Postretirement Benefit Plans (Textual) [Abstract]
Discount rate related to the postretirement plans				4.43%	3.94%	4.50%
Discount rate	3.55%		4.43%	3.55%	4.43%
Expected long-term return on plan assets				6250000.00%	6.50%	6.50%
United States [Member] | Minimum [Member] | Pension Plan [Member]
Postretirement Benefit Plans (Textual) [Abstract]
Discount rate related to the postretirement plans				3.67%	3.75%	4.34%
Discount rate	3.04%		4.05%	3.04%	4.05%
Expected long-term return on plan assets				5350000.00%	5.75%	5.75%
Future compensation assumption	2.50%		2.50%	2.50%	2.50%
United States [Member] | Forecast [Member] | Pension Plan [Member]
Postretirement Benefit Plans (Textual) [Abstract]
Discount rate related to the postretirement plans				3.50%
Expected long-term return on plan assets				5.22%
Foreign Plan [Member] | Pension Plan [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Defined Benefit Plan, Plan Assets, Contributions by Employer				$ 6,700,000	$ 6,000,000.0
Defined Benefit Plan, Benefit Obligation, Increase (Decrease) for Plan Amendment				0	(3,600,000)
Defined Benefit Plan, Actuarial Gain (Loss), Immediate Recognition as Component in Net Periodic Benefit (Cost) Credit				(17,400,000)	(8,800,000)	$ (100,000)
Current liabilities	$ 1,500,000		$ 1,500,000	$ 1,500,000	$ 1,500,000
Foreign Plan [Member] | Maximum [Member] | Pension Plan [Member]
Postretirement Benefit Plans (Textual) [Abstract]
Discount rate related to the postretirement plans				11.00%	9.00%	9.00%
Discount rate	9.00%		11.00%	9.00%	11.00%
Expected long-term return on plan assets				9.00%	9.00%	9.25%
Future compensation assumption	8.20%		8.23%	8.20%	8.23%
Foreign Plan [Member] | Minimum [Member] | Pension Plan [Member]
Postretirement Benefit Plans (Textual) [Abstract]
Discount rate related to the postretirement plans				1.50%	1.25%	1.25%
Discount rate	0.75%		1.50%	0.75%	1.50%
Expected long-term return on plan assets				2.50%	2.50%	0.75%
Future compensation assumption	2.00%		2.00%	2.00%	2.00%
Change in Assumptions for Defined Benefit Plans [Member] | Postretirement Benefit Plans [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Defined Benefit Plan, Actuarial Gain (Loss), Immediate Recognition as Component in Net Periodic Benefit (Cost) Credit				$ 22,700,000
Mortality Tables [Member] | Postretirement Benefit Plans [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Defined Benefit Plan, Actuarial Gain (Loss), Immediate Recognition as Component in Net Periodic Benefit (Cost) Credit						$ (14,400,000)
Return on Plan Assets vs. Expectation [Domain] | Pension Plan [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Defined Benefit Plan, Actuarial Gain (Loss), Immediate Recognition as Component in Net Periodic Benefit (Cost) Credit				90,100,000	$ 17,800,000	38,400,000
Return on Plan Assets vs. Expectation [Domain] | Postretirement Benefit Plans [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Defined Benefit Plan, Actuarial Gain (Loss), Immediate Recognition as Component in Net Periodic Benefit (Cost) Credit				3,600,000	4,000,000.0	3,700,000
Other Valuation Assumptions [Domain] | Pension Plan [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Defined Benefit Plan, Actuarial Gain (Loss), Immediate Recognition as Component in Net Periodic Benefit (Cost) Credit				3,100,000	62,400,000	8,700,000
Other Valuation Assumptions [Domain] | Postretirement Benefit Plans [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Defined Benefit Plan, Actuarial Gain (Loss), Immediate Recognition as Component in Net Periodic Benefit (Cost) Credit				5,200,000	300,000	12,200,000
Discount Rate In Basis Points [Domain] | Pension Plan [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Defined Benefit Plan, Actuarial Gain (Loss), Immediate Recognition as Component in Net Periodic Benefit (Cost) Credit				86	56	54
Discount Rate In Basis Points [Domain] | Postretirement Benefit Plans [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Defined Benefit Plan, Actuarial Gain (Loss), Immediate Recognition as Component in Net Periodic Benefit (Cost) Credit				(87)	(73)	(40)
Discount Rate In Dollars [Domain] | Pension Plan [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Defined Benefit Plan, Actuarial Gain (Loss), Immediate Recognition as Component in Net Periodic Benefit (Cost) Credit				100,900,000	83,400,000	52,900,000
Discount Rate In Dollars [Domain] | Postretirement Benefit Plans [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Defined Benefit Plan, Actuarial Gain (Loss), Immediate Recognition as Component in Net Periodic Benefit (Cost) Credit				$ (13,500,000)	10,600,000	(6,900,000)
Employee Opt-Out Program [Member] | Postretirement Benefit Plans [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Defined Benefit Plan, Actuarial Gain (Loss), Immediate Recognition as Component in Net Periodic Benefit (Cost) Credit					$ (10,400,000)	$ (5,000,000.0)