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Summary of Significant Accounting Policies, Leases (Details) - USD ($) $ in Millions | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Jan. 01, 2019
Lease, practical expedient | true |  |
Lease liabilities | $ 229.1 | $ 199.4 |
Operating lease right-of-use assets (included in other long-term assets) | 224.4 | 196.7 |
Retained earnings | $ 3,705.4 | $ 3,348.4 |
Minimum |  |  |
Lease, renewal term | 1 year |  |
Minimum | Real Estate Leases [Member] |  |  |
Lease term | 2 years |  |
Maximum |  |  |
Lease, renewal term | 6 years |  |
Maximum | Real Estate Leases [Member] |  |  |
Lease term | 12 years |  |
Impact of ASU 2016-02 |  |  |
Lease liabilities |  |  | $ 180.0
Operating lease right-of-use assets (included in other long-term assets) |  |  | 180.0
Retained earnings |  |  | $ 0.0

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