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Employee Benefit Obligations - Fair Value of Assets (Details) - Defined Benefit Pension Plans - USD ($) $ in Millions | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | --- | ---
Pension assets at fair value |  |  |
Total assets. | $ 5,716.0 | $ 5,175.0 | $ 6,052.0
US Plan |  |  |
Pension assets at fair value |  |  |
Total assets. | 2,202.0 | 1,901.0 | 2,420.0
US Plan | Fair Value Inputs Level 1 And Level 2 |  |  |
Pension assets at fair value |  |  |
Total assets. | 2,034.0 | 1,741.0 |
US Plan | Fair Value Inputs Level 1 And Level 2 | Cash and cash equivalents |  |  |
Pension assets at fair value |  |  |
Total assets. | 99.0 | 98.0 |
US Plan | Fair Value Inputs Level 1 And Level 2 | Consumer discretionary Securities |  |  |
Pension assets at fair value |  |  |
Total assets. | 83.0 | 61.0 |
US Plan | Fair Value Inputs Level 1 And Level 2 | Financials corporate equity securities |  |  |
Pension assets at fair value |  |  |
Total assets. | 64.0 | 54.0 |
US Plan | Fair Value Inputs Level 1 And Level 2 | Healthcare Corporate equity securities |  |  |
Pension assets at fair value |  |  |
Total assets. | 63.0 | 49.0 |
US Plan | Fair Value Inputs Level 1 And Level 2 | Industrials corporate equity securities |  |  |
Pension assets at fair value |  |  |
Total assets. | 76.0 | 59.0 |
US Plan | Fair Value Inputs Level 1 And Level 2 | Information technology corporate equity securities |  |  |
Pension assets at fair value |  |  |
Total assets. | 111.0 | 73.0 |
US Plan | Fair Value Inputs Level 1 And Level 2 | Utilities Equity Securities [Member] |  |  |
Pension assets at fair value |  |  |
Total assets. | 48.0 |  |
US Plan | Fair Value Inputs Level 1 And Level 2 | Other corporate equity securities |  |  |
Pension assets at fair value |  |  |
Total assets. | 18.0 | 50.0 |
US Plan | Fair Value Inputs Level 1 And Level 2 | FHLMC mortgage backed securities |  |  |
Pension assets at fair value |  |  |
Total assets. | 42.0 | 40.0 |
US Plan | Fair Value Inputs Level 1 And Level 2 | FNMA mortgage backed securities |  |  |
Pension assets at fair value |  |  |
Total assets. | 73.0 | 65.0 |
US Plan | Fair Value Inputs Level 1 And Level 2 | Municipal bonds |  |  |
Pension assets at fair value |  |  |
Total assets. | 27.0 | 52.0 |
US Plan | Fair Value Inputs Level 1 And Level 2 | Treasury bonds |  |  |
Pension assets at fair value |  |  |
Total assets. | 69.0 | 45.0 |
US Plan | Fair Value Inputs Level 1 And Level 2 | U.S. government and agency securities-Other |  |  |
Pension assets at fair value |  |  |
Total assets. | 45.0 | 10.0 |
US Plan | Fair Value Inputs Level 1 And Level 2 | Corporate bonds and notes-Communications |  |  |
Pension assets at fair value |  |  |
Total assets. | 79.0 | 67.0 |
US Plan | Fair Value Inputs Level 1 And Level 2 | Corporate bonds and notes-Consumer discretionary |  |  |
Pension assets at fair value |  |  |
Total assets. | 99.0 | 80.0 |
US Plan | Fair Value Inputs Level 1 And Level 2 | Corporate bonds and notes-Consumer staples |  |  |
Pension assets at fair value |  |  |
Total assets. | 100.0 | 41.0 |
US Plan | Fair Value Inputs Level 1 And Level 2 | Corporate bonds and notes-Financials |  |  |
Pension assets at fair value |  |  |
Total assets. | 261.0 | 245.0 |
US Plan | Fair Value Inputs Level 1 And Level 2 | Corporate bonds and notes-Healthcare |  |  |
Pension assets at fair value |  |  |
Total assets. | 91.0 | 88.0 |
US Plan | Fair Value Inputs Level 1 And Level 2 | Corporate bonds and notes-Industrials |  |  |
Pension assets at fair value |  |  |
Total assets. | 101.0 | 100.0 |
US Plan | Fair Value Inputs Level 1 And Level 2 | Corporate bonds and notes-Information technology |  |  |
Pension assets at fair value |  |  |
Total assets. | 78.0 | 54.0 |
US Plan | Fair Value Inputs Level 1 And Level 2 | Corporate bonds and notes-Oil and gas |  |  |
Pension assets at fair value |  |  |
Total assets. | 91.0 | 103.0 |
US Plan | Fair Value Inputs Level 1 And Level 2 | Corporate bonds and notes-Private placement |  |  |
Pension assets at fair value |  |  |
Total assets. | 62.0 | 69.0 |
US Plan | Fair Value Inputs Level 1 And Level 2 | Corporate bonds and notes-Utilities |  |  |
Pension assets at fair value |  |  |
Total assets. | 101.0 | 88.0 |
US Plan | Fair Value Inputs Level 1 And Level 2 | Corporate bonds and notes-Other |  |  |
Pension assets at fair value |  |  |
Total assets. | 50.0 | 60.0 |
US Plan | Fair Value Inputs Level 1 And Level 2 | Commingled funds |  |  |
Pension assets at fair value |  |  |
Total assets. | 103.0 |  |
US Plan | Fair Value Inputs Level 1 And Level 2 | International Commingled Funds |  |  |
Pension assets at fair value |  |  |
Total assets. |  | 90.0 |
US Plan | Level 1 |  |  |
Pension assets at fair value |  |  |
Total assets. | 554.0 | 410.0 |
US Plan | Level 1 | Cash and cash equivalents |  |  |
Pension assets at fair value |  |  |
Total assets. |  | 1.0 |
US Plan | Level 1 | Consumer discretionary Securities |  |  |
Pension assets at fair value |  |  |
Total assets. | 83.0 | 61.0 |
US Plan | Level 1 | Financials corporate equity securities |  |  |
Pension assets at fair value |  |  |
Total assets. | 64.0 | 54.0 |
US Plan | Level 1 | Healthcare Corporate equity securities |  |  |
Pension assets at fair value |  |  |
Total assets. | 63.0 | 49.0 |
US Plan | Level 1 | Industrials corporate equity securities |  |  |
Pension assets at fair value |  |  |
Total assets. | 76.0 | 59.0 |
US Plan | Level 1 | Information technology corporate equity securities |  |  |
Pension assets at fair value |  |  |
Total assets. | 111.0 | 73.0 |
US Plan | Level 1 | Utilities Equity Securities [Member] |  |  |
Pension assets at fair value |  |  |
Total assets. | 48.0 |  |
US Plan | Level 1 | Other corporate equity securities |  |  |
Pension assets at fair value |  |  |
Total assets. | 18.0 | 50.0 |
US Plan | Level 1 | Treasury bonds |  |  |
Pension assets at fair value |  |  |
Total assets. | 69.0 | 45.0 |
US Plan | Level 1 | Commingled funds |  |  |
Pension assets at fair value |  |  |
Total assets. | 22.0 |  |
US Plan | Level 1 | International Commingled Funds |  |  |
Pension assets at fair value |  |  |
Total assets. |  | 18.0 |
US Plan | Level 2 |  |  |
Pension assets at fair value |  |  |
Total assets. | 1,480.0 | 1,331.0 |
US Plan | Level 2 | Cash and cash equivalents |  |  |
Pension assets at fair value |  |  |
Total assets. | 99.0 | 97.0 |
US Plan | Level 2 | FHLMC mortgage backed securities |  |  |
Pension assets at fair value |  |  |
Total assets. | 42.0 | 40.0 |
US Plan | Level 2 | FNMA mortgage backed securities |  |  |
Pension assets at fair value |  |  |
Total assets. | 73.0 | 65.0 |
US Plan | Level 2 | Municipal bonds |  |  |
Pension assets at fair value |  |  |
Total assets. | 27.0 | 52.0 |
US Plan | Level 2 | U.S. government and agency securities-Other |  |  |
Pension assets at fair value |  |  |
Total assets. | 45.0 | 10.0 |
US Plan | Level 2 | Corporate bonds and notes-Communications |  |  |
Pension assets at fair value |  |  |
Total assets. | 79.0 | 67.0 |
US Plan | Level 2 | Corporate bonds and notes-Consumer discretionary |  |  |
Pension assets at fair value |  |  |
Total assets. | 99.0 | 80.0 |
US Plan | Level 2 | Corporate bonds and notes-Consumer staples |  |  |
Pension assets at fair value |  |  |
Total assets. | 100.0 | 41.0 |
US Plan | Level 2 | Corporate bonds and notes-Financials |  |  |
Pension assets at fair value |  |  |
Total assets. | 261.0 | 245.0 |
US Plan | Level 2 | Corporate bonds and notes-Healthcare |  |  |
Pension assets at fair value |  |  |
Total assets. | 91.0 | 88.0 |
US Plan | Level 2 | Corporate bonds and notes-Industrials |  |  |
Pension assets at fair value |  |  |
Total assets. | 101.0 | 100.0 |
US Plan | Level 2 | Corporate bonds and notes-Information technology |  |  |
Pension assets at fair value |  |  |
Total assets. | 78.0 | 54.0 |
US Plan | Level 2 | Corporate bonds and notes-Oil and gas |  |  |
Pension assets at fair value |  |  |
Total assets. | 91.0 | 103.0 |
US Plan | Level 2 | Corporate bonds and notes-Private placement |  |  |
Pension assets at fair value |  |  |
Total assets. | 62.0 | 69.0 |
US Plan | Level 2 | Corporate bonds and notes-Utilities |  |  |
Pension assets at fair value |  |  |
Total assets. | 101.0 | 88.0 |
US Plan | Level 2 | Corporate bonds and notes-Other |  |  |
Pension assets at fair value |  |  |
Total assets. | 50.0 | 60.0 |
US Plan | Level 2 | Commingled funds |  |  |
Pension assets at fair value |  |  |
Total assets. | 81.0 |  |
US Plan | Level 2 | International Commingled Funds |  |  |
Pension assets at fair value |  |  |
Total assets. |  | 72.0 |
US Plan | NAV |  |  |
Pension assets at fair value |  |  |
Total assets. | 168.0 | 160.0 |
Foreign |  |  |
Pension assets at fair value |  |  |
Total assets. | 3,514.0 | 3,274.0 | $ 3,632.0
U.K. |  |  |
Pension assets at fair value |  |  |
Total assets. | 3,457.0 | 3,195.0 |
U.K. | Level 1 |  |  |
Pension assets at fair value |  |  |
Total assets. | 2,806.0 | 2,282.0 |
U.K. | Level 1 | Cash and cash equivalents |  |  |
Pension assets at fair value |  |  |
Total assets. | 40.0 | 20.0 |
U.K. | Level 1 | Equity commingled funds |  |  |
Pension assets at fair value |  |  |
Total assets. | 162.0 |  |
U.K. | Level 1 | U.K. government bonds |  |  |
Pension assets at fair value |  |  |
Total assets. | 2,576.0 | 2,229.0 |
U.K. | Level 1 | Other. |  |  |
Pension assets at fair value |  |  |
Total assets. | 28.0 | 33.0 |
U.K. | Level 2 | Corporate bonds and notes |  |  |
Pension assets at fair value |  |  |
Total assets. | 478.0 |  |
U.K. | NAV | Investment funds - property |  |  |
Pension assets at fair value |  |  |
Total assets. | $ 173.0 | $ 913.0 |

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