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Commitments, Contingencies and Other Items Commitments, Contingencies and Other Items (Leases) (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Lessee, Lease, Description [Line Items]        
Operating lease, weighted average lease term 1 year 10 months 24 days   1 year 10 months 24 days  
Operating lease, right-of-use asset $ 19.1   $ 19.1  
Operating lease, liability 19.1   19.1  
Operating lease, expense $ 2.5   $ 4.2  
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 $ 20.2   $ 20.2  
Other liabilities        
Lessee, Lease, Description [Line Items]        
Finance lease, liability 25.5   25.5  
Other Operating Income (Expense), Net        
Lessee, Lease, Description [Line Items]        
Finance lease, interest expense 0.6 $ 0.7 1.3 $ 1.3
Finance lease, right-of-use asset, amortization $ 0.2 $ 0.2 $ 0.4 $ 0.4