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Pension and Other Retiree Benefits (Fair Value of Plan Assets) (Details) - Pension - USD ($) $ in Millions | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | --- | ---
U.S. |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined Benefit Plan, Plan Assets, Amount |  | $ 158.0 | $ 141.1 | $ 162.1
U.S. | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined Benefit Plan, Plan Assets, Amount |  | 151.6 | 131.1 |
U.S. | Fair Value, Inputs, Level 2 |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined Benefit Plan, Plan Assets, Amount |  | 1.5 | 1.7 |
U.S. | Significant Unobservable Inputs (Level 3) |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined Benefit Plan, Plan Assets, Amount |  | 0.0 | 0.0 |
U.S. | Mutual Funds | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined Benefit Plan, Plan Assets, Amount |  | 103.2 | 77.1 |
U.S. | Mutual Funds | Fair Value, Inputs, Level 2 |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined Benefit Plan, Plan Assets, Amount |  |  | 0.0 |
U.S. | Mutual Funds | Significant Unobservable Inputs (Level 3) |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined Benefit Plan, Plan Assets, Amount |  |  | 0.0 |
U.S. | Mutual Funds | Fair Value, Inputs, Level 1, 2 and 3 |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined Benefit Plan, Plan Assets, Amount |  |  | 77.1 |
U.S. | Equity Funds | Fair Value, Inputs, Level 2 |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined Benefit Plan, Plan Assets, Amount |  | 0.0 |  |
U.S. | Equity Funds | Significant Unobservable Inputs (Level 3) |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined Benefit Plan, Plan Assets, Amount |  | 0.0 |  |
U.S. | Equity Funds | Fair Value, Inputs, Level 1, 2 and 3 |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined Benefit Plan, Plan Assets, Amount |  | 103.2 |  |
U.S. | Exchange traded funds | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined Benefit Plan, Plan Assets, Amount |  | 48.4 | 54.0 |
U.S. | Exchange traded funds | Fair Value, Inputs, Level 2 |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined Benefit Plan, Plan Assets, Amount |  | 0.0 | 0.0 |
U.S. | Exchange traded funds | Significant Unobservable Inputs (Level 3) |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined Benefit Plan, Plan Assets, Amount |  | 0.0 | 0.0 |
U.S. | Exchange traded funds | Fair Value, Inputs, Level 1, 2 and 3 |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined Benefit Plan, Plan Assets, Amount |  | 48.4 | 54.0 |
U.S. | Common collective trust | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined Benefit Plan, Plan Assets, Amount |  | 0.0 | 0.0 |
U.S. | Common collective trust | Fair Value, Inputs, Level 2 |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined Benefit Plan, Plan Assets, Amount |  | 1.5 | 1.7 |
U.S. | Common collective trust | Significant Unobservable Inputs (Level 3) |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined Benefit Plan, Plan Assets, Amount |  | 0.0 | 0.0 |
U.S. | Common collective trust | Fair Value, Inputs, Level 1, 2 and 3 |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined Benefit Plan, Plan Assets, Amount |  | 1.5 | 1.7 |
U.S. | Multi-strategy hedge funds | Fair Value Measured at Net Asset Value Per Share [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined Benefit Plan, Plan Assets, Amount | [1] | 4.9 | 8.3 |
International |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined Benefit Plan, Plan Assets, Amount |  | 460.3 | 417.6 | $ 463.8
International | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined Benefit Plan, Plan Assets, Amount |  | 61.7 | 68.7 |
International | Fair Value, Inputs, Level 2 |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined Benefit Plan, Plan Assets, Amount |  | 331.2 | 307.4 |
International | Significant Unobservable Inputs (Level 3) |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined Benefit Plan, Plan Assets, Amount |  | 0.0 | 0.0 |
International | Cash and cash equivalents | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined Benefit Plan, Plan Assets, Amount |  | 1.4 | 2.7 |
International | Cash and cash equivalents | Fair Value, Inputs, Level 2 |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined Benefit Plan, Plan Assets, Amount |  | 0.0 | 0.0 |
International | Cash and cash equivalents | Significant Unobservable Inputs (Level 3) |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined Benefit Plan, Plan Assets, Amount |  | 0.0 | 0.0 |
International | Cash and cash equivalents | Fair Value, Inputs, Level 1, 2 and 3 |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined Benefit Plan, Plan Assets, Amount |  | 1.4 | 2.7 |
International | Equity Funds | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined Benefit Plan, Plan Assets, Amount |  | 59.9 | 65.7 |
International | Equity Funds | Fair Value, Inputs, Level 2 |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined Benefit Plan, Plan Assets, Amount |  | 0.0 | 0.0 |
International | Equity Funds | Significant Unobservable Inputs (Level 3) |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined Benefit Plan, Plan Assets, Amount |  | 0.0 | 0.0 |
International | Equity Funds | Fair Value, Inputs, Level 1, 2 and 3 |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined Benefit Plan, Plan Assets, Amount |  | 59.9 | 65.7 |
International | Exchange traded funds | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined Benefit Plan, Plan Assets, Amount |  | 0.4 | 0.3 |
International | Exchange traded funds | Fair Value, Inputs, Level 2 |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined Benefit Plan, Plan Assets, Amount |  | 0.0 | 0.0 |
International | Exchange traded funds | Significant Unobservable Inputs (Level 3) |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined Benefit Plan, Plan Assets, Amount |  | 0.0 | 0.0 |
International | Exchange traded funds | Fair Value, Inputs, Level 1, 2 and 3 |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined Benefit Plan, Plan Assets, Amount |  | 0.4 | 0.3 |
International | Foreign corporate debt securities | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined Benefit Plan, Plan Assets, Amount |  | 0.0 | 0.0 |
International | Foreign corporate debt securities | Fair Value, Inputs, Level 2 |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined Benefit Plan, Plan Assets, Amount |  | 79.3 | 71.7 |
International | Foreign corporate debt securities | Significant Unobservable Inputs (Level 3) |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined Benefit Plan, Plan Assets, Amount |  | 0.0 | 0.0 |
International | Foreign corporate debt securities | Fair Value, Inputs, Level 1, 2 and 3 |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined Benefit Plan, Plan Assets, Amount |  | 79.3 | 71.7 |
International | Multi-strategy hedge funds | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined Benefit Plan, Plan Assets, Amount |  | 0.0 | 0.0 |
International | Multi-strategy hedge funds | Fair Value, Inputs, Level 2 |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined Benefit Plan, Plan Assets, Amount |  | 85.9 | 196.3 |
International | Multi-strategy hedge funds | Significant Unobservable Inputs (Level 3) |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined Benefit Plan, Plan Assets, Amount |  | 0.0 | 0.0 |
International | Multi-strategy hedge funds | Fair Value, Inputs, Level 1, 2 and 3 |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined Benefit Plan, Plan Assets, Amount |  | 85.9 | 196.3 |
International | Multi-strategy hedge funds | Fair Value Measured at Net Asset Value Per Share [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined Benefit Plan, Plan Assets, Amount | [1] | 57.0 | 21.0 |
International | Insurance contracts | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined Benefit Plan, Plan Assets, Amount |  | 0.0 | 0.0 |
International | Insurance contracts | Fair Value, Inputs, Level 2 |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined Benefit Plan, Plan Assets, Amount |  | 29.6 | 25.4 |
International | Insurance contracts | Significant Unobservable Inputs (Level 3) |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined Benefit Plan, Plan Assets, Amount |  | 0.0 | 0.0 |
International | Insurance contracts | Fair Value, Inputs, Level 1, 2 and 3 |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined Benefit Plan, Plan Assets, Amount |  | 29.6 | 25.4 |
International | Real estate | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined Benefit Plan, Plan Assets, Amount |  | 0.0 |  |
International | Real estate | Fair Value, Inputs, Level 2 |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined Benefit Plan, Plan Assets, Amount |  | 3.9 |  |
International | Real estate | Significant Unobservable Inputs (Level 3) |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined Benefit Plan, Plan Assets, Amount |  |  |  |
International | Real estate | Fair Value, Inputs, Level 1, 2 and 3 |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined Benefit Plan, Plan Assets, Amount |  | 3.9 |  |
International | Foreign government debt securities | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined Benefit Plan, Plan Assets, Amount |  | 0.0 | 0.0 |
International | Foreign government debt securities | Fair Value, Inputs, Level 2 |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined Benefit Plan, Plan Assets, Amount |  | 132.5 | 14.0 |
International | Foreign government debt securities | Significant Unobservable Inputs (Level 3) |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined Benefit Plan, Plan Assets, Amount |  | 0.0 | 0.0 |
International | Foreign government debt securities | Fair Value, Inputs, Level 1, 2 and 3 |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined Benefit Plan, Plan Assets, Amount |  | 132.5 | 14.0 |
International | Real estate | Fair Value Measured at Net Asset Value Per Share [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined Benefit Plan, Plan Assets, Amount | [1] | $ 10.4 | $ 20.5 |
[1] | Certain investments that are measured at fair value using the net asset value per share practical expedient have not been categorized in the fair value hierarchy. The fair value amounts presented in these tables are intended to permit reconciliation of the fair value hierarchy to the amounts presented in the table that presents our defined benefit pension and post-retirement plans funded status.

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