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Recently Issued and Adopted Accounting Pronouncements and Regulatory Items Narrative (Details) $ in Millions | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2018 USD ($) | Feb. 28, 2019 lease | Jan. 01, 2019 USD ($)
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Number of leases | lease |  | 1,400 |
Adjustment to provisional tax expense | $ 7.8 |  |
Accounting Standards Update 2018-05 |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Adjustment to provisional tax expense | $ 8.5 |  |
Minimum | Accounting Standards Update 2016-02 |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Lease asset |  |  | $ 180.0
Lease liability |  |  | 210.0
Maximum | Accounting Standards Update 2016-02 |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Lease asset |  |  | 220.0
Lease liability |  |  | $ 250.0

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