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Commitments, Contingencies and Other Items Commitments, Contingencies and Other Items (Leases) (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Dec. 31, 2018
Lessee, Lease, Description [Line Items]          
Operating lease, weighted average lease term 2 years 3 months 18 days   2 years 3 months 18 days    
Operating lease, right-of-use asset $ 20.8   $ 20.8    
Operating lease, liability 20.9   20.9    
Operating lease, expense $ 3.4   $ 7.6    
Lessee, operating lease, term of contract 20 years   20 years    
Lessee, operating lease, renewal term 30 years   30 years    
Other assets          
Lessee, Lease, Description [Line Items]          
Finance lease, right-of-use asset $ 20.0   $ 20.0   $ 20.6
Other liabilities          
Lessee, Lease, Description [Line Items]          
Finance lease, liability 25.3   25.3   $ 25.6
Other Operating Income (Expense), Net          
Lessee, Lease, Description [Line Items]          
Finance lease, interest expense 0.6 $ 0.7 1.9 $ 2.0  
Finance lease, right-of-use asset, amortization $ 0.2 $ 0.2 $ 0.7 $ 0.7