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Leases And Other Commitments - Narrative (Details) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2019 USD ($) renewal_term finance_lease | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) | Jan. 01, 2019 USD ($)
Operating Leased Assets [Line Items] |  |  |  |
Operating lease right-of-use assets | $ 71.5 | $ 0.0 |  | $ 26.7
Finance lease right-of-use assets |  |  |  | 15.3
Operating lease liability | 86.0 |  |  | 40.4
Finance lease liability | 15.0 |  |  | 15.9
Rent expense |  | $ 12.5 | $ 11.1 |
Amortization of operating lease right-of-use asset | 9.1 |  |  |
Purchase obligations | $ 165.8 |  |  |
Term of purchase obligations | 1 year |  |  |
Leased Buildings - Mesa, Arizona Expiring March 2028 |  |  |  |
Operating Leased Assets [Line Items] |  |  |  |
Renewal term | 5 years |  |  |
Number of financing leases | finance_lease | 1 |  |  |
Number of renewal terms | renewal_term | 4 |  |  |
Minimum |  |  |  |
Operating Leased Assets [Line Items] |  |  |  |
Renewal term | 3 years |  |  |
Remaining lease terms | 1 year |  |  |
Maximum |  |  |  |
Operating Leased Assets [Line Items] |  |  |  |
Renewal term | 5 years |  |  |
Remaining lease terms | 13 years |  |  |
Retained Earnings | Accounting Standards Update 2016-02 |  |  |  |
Operating Leased Assets [Line Items] |  |  |  |
Cumulative-effect adjustment |  |  |  | $ (2.1)

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