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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