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Summary of Significant Accounting Policies (Narrative) (Details) - USD ($) shares in Millions, $ in Millions |  | 12 Months Ended |
--- | --- | --- | ---
May 31, 2016 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Jan. 01, 2019
Minimum Voting Securities Owned |  | 20.00% |  |  |
Research and development costs |  | $ 807.0 | $ 689.0 | $ 637.0 |
Gain (loss) from foreign currency transaction activity |  | (43.0) | 20.0 |  |
Share-based compensation expense |  | $ 51.0 | $ 46.0 | $ 42.0 |
Benchmark Percentage of Benefit Obligation or Market Related Value of Plan Assets |  | 10.00% |  |  |
Plans [Member] |  |  |  |  |
Unissued common shares available for future grants authorized |  | 62 |  |  |
Accounting Standards Update 2014-09 [Member] | Retained Earnings [Member] | Subsequent Event [Member] |  |  |  |  |
New Accounting Pronouncement or Change in Accounting Principle, Cumulative Effect of Change on Equity or Net Assets |  |  |  |  | $ 230.0
Accounting Standards Update 2016-02 [Member] | Subsequent Event [Member] |  |  |  |  |
New Accounting Pronouncement or Change in Accounting Principle, Cumulative Effect of Change on Equity or Net Assets |  |  |  |  | $ 450.0
Minimum [Member] |  |  |  |  |
Equity Method Investment, Ownership Percentage |  | 20.00% |  |  |
Intangible asset estimated useful lives |  | 4 years |  |  |
Minimum [Member] | Stock Compensation Plan [Member] |  |  |  |  |
Share-based compensation award exercisable installment period |  | 1 year |  |  |
Minimum [Member] | Restricted Stock [Member] |  |  |  |  |
Share-based compensation award exercisable installment period |  | 1 year |  |  |
Share-based compensation award expiration period |  | 1 year |  |  |
Maximum [Member] |  |  |  |  |
Equity Method Investment, Ownership Percentage |  | 50.00% |  |  |
Intangible asset estimated useful lives |  | 50 years |  |  |
Maximum [Member] | Stock Compensation Plan [Member] |  |  |  |  |
Share-based compensation award exercisable installment period |  | 5 years |  |  |
Share-based compensation award expiration period |  | 10 years |  |  |
Maximum [Member] | Restricted Stock [Member] |  |  |  |  |
Share-based compensation award exercisable installment period |  | 10 years |  |  |
Share-based compensation award expiration period |  | 10 years |  |  |
Building [Member] | Minimum [Member] |  |  |  |  |
Estimated useful lives |  | 10 years |  |  |
Building [Member] | Maximum [Member] |  |  |  |  |
Estimated useful lives |  | 40 years |  |  |
Equipment [Member] | Minimum [Member] |  |  |  |  |
Estimated useful lives |  | 2 years |  |  |
Equipment [Member] | Maximum [Member] |  |  |  |  |
Estimated useful lives |  | 20 years |  |  |
Dow Corning Corporation [Member] |  |  |  |  |
Equity Method Investment, Ownership Percentage | 50.00% |  |  |  |
Subsidiary or Equity Method Investee, Cumulative Percentage Ownership after All Transactions | 100.00% |  |  |  |
Equity Method Investments | $ 4,800.0 |  |  |  |

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