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Employee Benefit Plans - Defined Benefit Pension Plan Assets by Category and Fair Value Hierarchy (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2019 | Dec. 31, 2018
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | $ 636.6 | $ 625.8
Fair Value, Inputs, Level 1 [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 509.6 | 481.3
Fair Value, Inputs, Level 2 [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 61.9 | 80.3
Fair Value, Inputs, Level 3 [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 0.0 | 0.0
Cash and Cash Equivalents [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 9.3 | 6.7
Cash and Cash Equivalents [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 7.3 | 3.5
Cash and Cash Equivalents [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 2.0 | 3.2
Cash and Cash Equivalents [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 0.0 | 0.0
U.S. Large Cap [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 85.4 | 75.9
U.S. Large Cap [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 82.4 | 72.5
U.S. Large Cap [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 3.0 | 3.4
U.S. Large Cap [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 0.0 | 0.0
U.S. Small/Mid Cap [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 22.7 | 17.5
U.S. Small/Mid Cap [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 22.7 | 17.4
U.S. Small/Mid Cap [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 0.0 | 0.1
U.S. Small/Mid Cap [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 0.0 | 0.0
World Equity [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 92.8 | 84.8
World Equity [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 88.1 | 79.5
World Equity [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 4.7 | 5.3
World Equity [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 0.0 | 0.0
Government & Agencies [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 119.3 | 140.8
Government & Agencies [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 74.3 | 86.5
Government & Agencies [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 45.0 | 54.3
Government & Agencies [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 0.0 | 0.0
Corporate Bonds - Investment Grade [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 186.4 | 179.9
Corporate Bonds - Investment Grade [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 185.8 | 177.2
Corporate Bonds - Investment Grade [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 0.6 | 2.7
Corporate Bonds - Investment Grade [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 0.0 | 0.0
Corporate Bonds - Non-investment Grade [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 22.8 | 21.3
Corporate Bonds - Non-investment Grade [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 21.7 | 19.8
Corporate Bonds - Non-investment Grade [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 1.1 | 1.5
Corporate Bonds - Non-investment Grade [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 0.0 | 0.0
Emerging Market Debt [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 21.1 | 18.9
Emerging Market Debt [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 20.4 | 18.0
Emerging Market Debt [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 0.7 | 0.9
Emerging Market Debt [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 0.0 | 0.0
Fixed Income Securities - Other [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 11.7 | 15.8
Fixed Income Securities - Other [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 6.9 | 6.9
Fixed Income Securities - Other [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 4.8 | 8.9
Fixed Income Securities - Other [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 0.0 | 0.0
Property Funds [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 57.3 | 56.0
Property Funds [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 0.0 | 0.0
Property Funds [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 0.0 | 0.0
Property Funds [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 0.0 | 0.0
Liquid Alternatives Fund [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 1.6 | 2.5
Liquid Alternatives Fund [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 0.0 | 0.0
Liquid Alternatives Fund [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 0.0 | 0.0
Liquid Alternatives Fund [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 0.0 | 0.0
Structured Credit Fund [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 6.2 | 5.7
Structured Credit Fund [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 0.0 | 0.0
Structured Credit Fund [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 0.0 | 0.0
Structured Credit Fund [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | $ 0.0 | $ 0.0
Domestic Plan [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined Benefit Plan, Plan Assets, Actual Allocation, Percentage | 100.00% | 100.00%
Domestic Plan [Member] | Equity Securities [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined Benefit Plan, Plan Assets, Actual Allocation, Percentage | 35.20% | 31.90%
Defined Benefit Plan, Plan Assets, Investment Policy and Strategy, Description | 30% - 55% |
Domestic Plan [Member] | Fixed income securities [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined Benefit Plan, Plan Assets, Actual Allocation, Percentage | 52.90% | 57.50%
Defined Benefit Plan, Plan Assets, Investment Policy and Strategy, Description | 40% - 60% |
Domestic Plan [Member] | Alternative assets [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined Benefit Plan, Plan Assets, Actual Allocation, Percentage | 10.40% | 10.00%
Defined Benefit Plan, Plan Assets, Investment Policy and Strategy, Description | 5% - 10% |
Domestic Plan [Member] | Cash and Cash Equivalents [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined Benefit Plan, Plan Assets, Actual Allocation, Percentage | 1.50% | 0.60%
Defined Benefit Plan, Plan Assets, Investment Policy and Strategy, Description | 0% - 5% |
Foreign Plan [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined Benefit Plan, Plan Assets, Actual Allocation, Percentage | 100.00% | 100.00%
Foreign Plan [Member] | Equity Securities [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined Benefit Plan, Plan Assets, Actual Allocation, Percentage | 22.70% | 19.00%
Defined Benefit Plan, Plan Assets, Investment Policy and Strategy, Description | 15% - 25% |
Foreign Plan [Member] | Fixed income securities [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined Benefit Plan, Plan Assets, Actual Allocation, Percentage | 66.80% | 68.30%
Defined Benefit Plan, Plan Assets, Investment Policy and Strategy, Description | 65% - 75% |
Foreign Plan [Member] | Alternative assets [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined Benefit Plan, Plan Assets, Actual Allocation, Percentage | 9.40% | 10.50%
Defined Benefit Plan, Plan Assets, Investment Policy and Strategy, Description | 5% - 15% |
Foreign Plan [Member] | Cash and Cash Equivalents [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined Benefit Plan, Plan Assets, Actual Allocation, Percentage | 1.10% | 2.20%
Defined Benefit Plan, Plan Assets, Investment Policy and Strategy, Description | 0% - 5% |

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