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Employee Benefit Plans - Defined Benefit Pension Plans (Details) $ in Millions	12 Months Ended
	Dec. 31, 2018 USD ($) $ / item	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)
Employee benefit plans
Fair value of plan assets	$ 397.2	$ 453.1
Fixed income common trust funds
Employee benefit plans
Fair value of plan assets	228.5	270.2
Commingled global fund allocations
Employee benefit plans
Fair value of plan assets	83.3	95.1
Corporate bonds
Employee benefit plans
Fair value of plan assets	0.0	1.6
Global equity common trust funds
Employee benefit plans
Fair value of plan assets	41.1	50.6
U.S. Government securities
Employee benefit plans
Fair value of plan assets	24.0	25.2
Short-term investments
Employee benefit plans
Fair value of plan assets	$ 7.8	9.4
Value of short-term investments (in dollars per unit) | $ / item	1.00
Non-U.S. Government securities
Employee benefit plans
Fair value of plan assets	$ 11.5	0.0
Global equities:
Employee benefit plans
Fair value of plan assets		0.0
Other
Employee benefit plans
Fair value of plan assets	1.0	1.0
Quoted Prices in Active Markets for Identical Assets (Level 1)
Employee benefit plans
Fair value of plan assets	7.8	9.4
Quoted Prices in Active Markets for Identical Assets (Level 1) | Fixed income common trust funds
Employee benefit plans
Fair value of plan assets	0.0	0.0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Commingled global fund allocations
Employee benefit plans
Fair value of plan assets	0.0	0.0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Corporate bonds
Employee benefit plans
Fair value of plan assets	0.0	0.0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Global equity common trust funds
Employee benefit plans
Fair value of plan assets	0.0	0.0
Quoted Prices in Active Markets for Identical Assets (Level 1) | U.S. Government securities
Employee benefit plans
Fair value of plan assets	0.0	0.0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Short-term investments
Employee benefit plans
Fair value of plan assets	7.8	9.4
Quoted Prices in Active Markets for Identical Assets (Level 1) | Non-U.S. Government securities
Employee benefit plans
Fair value of plan assets	0.0	0.0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Global equities:
Employee benefit plans
Fair value of plan assets		0.0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Other
Employee benefit plans
Fair value of plan assets	0.0	0.0
Significant Observable Inputs (Level 2)
Employee benefit plans
Fair value of plan assets	388.4	442.7
Significant Observable Inputs (Level 2) | Fixed income common trust funds
Employee benefit plans
Fair value of plan assets	228.5	270.2
Significant Observable Inputs (Level 2) | Commingled global fund allocations
Employee benefit plans
Fair value of plan assets	83.3	95.1
Significant Observable Inputs (Level 2) | Corporate bonds
Employee benefit plans
Fair value of plan assets	0.0	1.6
Significant Observable Inputs (Level 2) | Global equity common trust funds
Employee benefit plans
Fair value of plan assets	41.1	50.6
Significant Observable Inputs (Level 2) | U.S. Government securities
Employee benefit plans
Fair value of plan assets	24.0	25.2
Significant Observable Inputs (Level 2) | Short-term investments
Employee benefit plans
Fair value of plan assets	0.0	0.0
Significant Observable Inputs (Level 2) | Non-U.S. Government securities
Employee benefit plans
Fair value of plan assets	11.5	0.0
Significant Observable Inputs (Level 2) | Global equities:
Employee benefit plans
Fair value of plan assets		0.0
Significant Observable Inputs (Level 2) | Other
Employee benefit plans
Fair value of plan assets	0.0	0.0
Significant Observable Inputs (Level 2) | Collateralized Securities
Employee benefit plans
Fair value of plan assets		0.5
Significant Unobservable Inputs (Level 3)
Employee benefit plans
Fair value of plan assets	1.0	1.0
Significant Unobservable Inputs (Level 3) | Fixed income common trust funds
Employee benefit plans
Fair value of plan assets	0.0	0.0
Significant Unobservable Inputs (Level 3) | Commingled global fund allocations
Employee benefit plans
Fair value of plan assets	0.0	0.0
Significant Unobservable Inputs (Level 3) | Corporate bonds
Employee benefit plans
Fair value of plan assets	0.0	0.0
Significant Unobservable Inputs (Level 3) | Global equity common trust funds
Employee benefit plans
Fair value of plan assets	0.0	0.0
Significant Unobservable Inputs (Level 3) | U.S. Government securities
Employee benefit plans
Fair value of plan assets	0.0	0.0
Significant Unobservable Inputs (Level 3) | Short-term investments
Employee benefit plans
Fair value of plan assets	0.0	0.0
Significant Unobservable Inputs (Level 3) | Non-U.S. Government securities
Employee benefit plans
Fair value of plan assets	0.0	0.0
Significant Unobservable Inputs (Level 3) | Global equities:
Employee benefit plans
Fair value of plan assets		0.0
Significant Unobservable Inputs (Level 3) | Other
Employee benefit plans
Fair value of plan assets	$ 1.0	$ 1.0
United States
Employee benefit plans
Actual Allocations	100.00%	100.00%
Mid-point of Target Allocation Range	100.00%
Fair value of plan assets	$ 238.0	$ 269.7	$ 261.9
United States | Fixed income common trust funds
Employee benefit plans
Actual Allocations	70.00%	70.00%
Mid-point of Target Allocation Range	65.00%
United States | Commingled global fund allocations
Employee benefit plans
Actual Allocations	11.00%	12.00%
Mid-point of Target Allocation Range	18.00%
United States | Corporate bonds
Employee benefit plans
Actual Allocations	1.00%	1.00%
Mid-point of Target Allocation Range	0.00%
United States | Global equity common trust funds
Employee benefit plans
Actual Allocations	6.00%	7.00%
Mid-point of Target Allocation Range	5.00%
United States | U.S. Government securities
Employee benefit plans
Actual Allocations	10.00%	9.00%
Mid-point of Target Allocation Range	10.00%
United States | Short-term investments
Employee benefit plans
Actual Allocations	2.00%	1.00%
Mid-point of Target Allocation Range	2.00%
Foreign Plan
Employee benefit plans
Actual Allocations	100.00%	100.00%
Mid-point of Target Allocation Range	100.00%
Fair value of plan assets	$ 159.2	$ 183.4	$ 163.3
Foreign Plan | Fixed income common trust funds
Employee benefit plans
Actual Allocations	39.00%	46.00%
Mid-point of Target Allocation Range	39.00%
Foreign Plan | Commingled global fund allocations
Employee benefit plans
Actual Allocations	36.00%	34.00%
Mid-point of Target Allocation Range	37.00%
Foreign Plan | Global equity common trust funds
Employee benefit plans
Actual Allocations	17.00%	17.00%
Mid-point of Target Allocation Range	13.00%
Foreign Plan | Short-term investments
Employee benefit plans
Actual Allocations	1.00%	3.00%
Mid-point of Target Allocation Range	4.00%
Foreign Plan | Non-U.S. Government securities
Employee benefit plans
Actual Allocations	7.00%	0.00%
Mid-point of Target Allocation Range	7.00%

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Amount of asset segregated and restricted to provide benefit under defined benefit plan. Asset includes, but is not limited to, stock, bond, other investment, earning from investment, and contribution by employer and employee.

+ References

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