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Income Taxes (Narrative) (Details) $ / shares in Units, kr in Millions, $ in Millions |  | 6 Months Ended | 12 Months Ended |  |  |  |
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Dec. 31, 2017 USD ($) | Mar. 29, 2019 USD ($) | Dec. 31, 2019 USD ($) $ / shares | Dec. 31, 2018 USD ($) $ / shares | Dec. 31, 2017 USD ($) $ / shares | Dec. 16, 2019 DKK (kr) | Aug. 27, 2019 DKK (kr) | Dec. 31, 2016 USD ($) | Dec. 10, 2013 DKK (kr)
Discontinued operation, deferred tax assets |  |  |  | $ 131.0 |  |  |  |  |
Discontinued operations, deferred tax liabilities |  |  |  | 333.0 |  |  |  |  |
Net deferred tax liabilities |  |  | $ (1,652.2) | $ (2,311.2) |  |  |  |  |
Valuation allowance, deferred tax asset, change in amount |  |  | 128.0 |  |  |  |  |  |
Basis differences in investments outside the U.S. |  |  | $ 9,600.0 |  |  |  |  |  |
Statutory federal income tax rate | 21.00% |  | 21.00% | 21.00% | 35.00% |  |  |  |
Effective income tax rate |  |  | 26.40% | 18.80% | 14.60% |  |  |  |
Effective income tax rate reconciliation, other reconciling items, percent |  |  | (6.50%) | (1.20%) | (5.60%) |  |  |  |
Income tax payments |  |  | $ 847.0 | $ 673.0 | $ 689.0 |  |  |  |
Employee service share-based compensation, tax benefit from exercise of stock options |  |  | 79.0 | 57.0 | 85.0 |  |  |  |
Excess tax benefit from share-based compensation, operating activities |  |  | 55.0 | 38.0 | 55.0 |  |  |  |
Deferred tax assets, valuation allowances |  |  | 261.2 | 389.6 |  |  |  |  |
Gross unrecognized tax benefits | $ 736.8 |  | 1,180.9 | 986.0 | 736.8 |  |  | $ 992.2 |
Unrecognized tax benefits, net of offsetting indirect tax benefits |  |  |  | 988.0 |  |  |  |  |
Unrecognized tax benefits, indirect tax benefits |  |  |  | 117.0 |  |  |  |  |
Potential interest and penalties |  |  |  | (119.0) |  |  |  |  |
Recognized potential interest and penalties |  |  | 227.0 | 41.0 | 41.0 |  |  |  |
Unrecognized tax benefits that would impact effective tax rate |  |  | 1,300.0 |  |  |  |  |  |
Deferred tax asset, other |  |  |  |  |  |  |  |  |
Deferred tax assets, valuation allowances |  |  | 32.0 |  |  |  |  |  |
Domestic tax authority | IRS |  |  |  |  |  |  |  |  |
Proposed adjustments to taxable income, self-insurance, other |  | $ 2,700.0 |  |  |  |  |  |  |
Foreign tax authority |  |  |  |  |  |  |  |  |
Income tax examination, amount of tax assessments 2004-2009 |  |  | 266.0 |  |  |  |  |  | kr 1,800
Income tax examination, amount of tax assessments 2010-2012 |  |  | 159.0 |  |  |  | kr 1,100 |  |
Income tax examination, amount of tax assessments 2013-2015 |  |  | 113.0 |  |  | kr 751 |  |  |
Income tax holiday, aggregate dollar amount |  |  | $ 71.0 | $ 69.0 | $ 62.0 |  |  |  |
Income tax holiday, income tax benefits per diluted share | $ / shares |  |  | $ 0.10 | $ 0.10 | $ 0.09 |  |  |  |
United States |  |  |  |  |  |  |  |  |
Net deferred tax liabilities |  |  | $ (1,600.0) | $ (2,000.0) |  |  |  |  |
International |  |  |  |  |  |  |  |  |
Net deferred tax liabilities |  |  | (90.0) | (277.0) |  |  |  |  |
Discontinued operations |  |  |  |  |  |  |  |  |
Net deferred tax liabilities |  |  |  | $ (202.0) |  |  |  |  |
Continuing operations |  |  |  |  |  |  |  |  |
Net operating loss carryforwards |  |  | 504.0 |  |  |  |  |  |
Operating loss carryforwards, valuation allowances |  |  | 162.0 |  |  |  |  |  |
Gross unrecognized tax benefits |  |  | 1,200.0 |  |  |  |  |  |
Unrecognized tax benefits, net of offsetting indirect tax benefits |  |  | 1,400.0 |  |  |  |  |  |
Unrecognized tax benefits, indirect tax benefits |  |  | 131.0 |  |  |  |  |  |
Potential interest and penalties |  |  | (320.0) |  |  |  |  |  |
Estimated reduction in unrecognized tax benefits within twelve months |  |  | (368.0) |  |  |  |  |  |
Continuing operations | General business and foreign tax credit |  |  |  |  |  |  |  |  |
Tax credit carryforwards |  |  | 199.0 |  |  |  |  |  |
Tax credit carryforward, valuation allowance |  |  | $ 67.0 |  |  |  |  |  |

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