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Stock Purchase Plan (Details) $ in Millions | 12 Months Ended
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Dec. 31, 2019 USD ($) employee shares | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($)
Share-based Payment Arrangement [Abstract] |  |  |
Number of employees contributing to company's ESOP | employee | 41,946 |  |
Participants percentage contribution on a pretax basis only of their annual compensation (up to the lesser of) | 20.00% |  |
Percentage of matching contribution to ESOP Plan by employer | 100.00% |  |
Percentage of eligible contribution plan up to which employer contributes (up to) | 6.00% |  |
Company contributions to ESOP on behalf of participating employees representing amounts authorized by employees to be withheld from their earnings on pre-tax basis | $ 180.5 | $ 170.3 | $ 138.7
Company's matching contributions to the ESOP | $ 111.9 | $ 104.7 | $ 90.7
Employee stock ownership plan common stock shares held in ESOP (in shares) | shares | 8,433,722 |  |
Percentage of total voting shares outstanding held by the ESOP | 9.20% |  |

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- Definition Employers contributions to ESOP representing amounts authorized by employees to be withheld from their earnings on pre-tax basis. + References No definition available. + Details
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- Definition This item represents the amount of cash contributions during the period made by the entity to the Employee Stock Ownership Plan (ESOP). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 40 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109244661&loc=d3e17540-113929 + Details
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- Definition Sum of the allocated, committed-to-be-released and suspense shares of the entity held by the plan. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 40 -Section 50 -Paragraph 1 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=109244661&loc=d3e17540-113929 + Details
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