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Summary of Significant Accounting Policies, Recent Accounting Pronouncements (Details) - USD ($) $ in Millions | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2019 | Jan. 01, 2019 | Dec. 31, 2018
New Accounting Pronouncements |  |  |
Operating lease right-of-use assets (included in other long-term assets) | $ 196.7 |  |
Lease liabilities | 199.4 |  |
Retained earnings | $ 3,348.4 |  | $ 3,028.7
Lease, practical expedient | true |  |
Right-of-use assets obtained in exchange for lease liabilities | $ 98.6 |  |
Impact of ASU 2016-02 |  |  |
New Accounting Pronouncements |  |  |
Operating lease right-of-use assets (included in other long-term assets) |  | $ 180.0 |
Lease liabilities |  | 180.0 |
Retained earnings |  | $ 0.0 |

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