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Commitments and Contingencies (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017 | Dec. 31, 2017
Operating lease obligations: |  |  |  |  |
Lease and rental expense included in costs and expenses | $ 27.6 | $ 26.0 | $ 79.0 | $ 78.1 |
New Purchase Obligations [Member] |  |  |  |  |
Unrecorded Unconditional Purchase Obligation [Line Items] |  |  |  |  |
Unrecorded purchase obligation, next five years | 1,200.0 |  | 1,200.0 |  |
Unrecorded purchase obligation, in total | 1,800.0 |  | 1,800.0 |  |
Litigation matters [Member] |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |
Litigation accruals on an undiscounted basis | $ 0.5 |  | 0.5 |  | $ 4.5
Loss contingency, damages awarded |  |  | 319.4 |  |
Loss contingency, total damages sought |  |  | 535.8 |  |
Loss contingency, disgorgement damages sought |  |  | 150.0 |  |
Prejudgment interest |  |  | $ 66.4 |  |
Post-judgment interest rate |  |  | 5.00% |  |
Positive Outcome of Litigation [Member] |  |  |  |  |
Gain Contingencies [Line Items] |  |  |  |  |
Counterclaim settlement awarded |  |  | $ 0.8 |  |

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