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Commitments and Contingencies, Leases (Details)
$ in Millions
12 Months Ended
Dec. 31, 2015
USD ($)
Lease
Dec. 31, 2014
USD ($)
Dec. 31, 2013
USD ($)
Capital Leases [Abstract]      
Number of leases qualifying as capital leases | Lease 3    
Amortization expense under capital lease assets $ 8.2 $ 7.2 $ 6.3
Property Held Under Capital Leases, Net [Abstract]      
Property held under capital lease 221.2 221.2  
Accumulated depreciation (57.2) (49.0)  
Total property held under capital leases, net $ 164.0 172.2  
Operating Leased Assets [Line Items]      
Operating Lease Purchase Power Agreement Expiration (years) 2032    
Operating Leases, Future Minimum Payments Due [Abstract]      
2016 $ 114.2    
2017 103.6    
2018 103.4    
2019 104.3    
2020 105.1    
Thereafter 619.2    
Capital Leases, Future Minimum Payments Due [Abstract]      
2016 29.3    
2017 25.7    
2018 25.3    
2019 25.1    
2020 24.9    
Thereafter 486.5    
Total minimum obligation 616.8    
Interest component of obligation (452.8)    
Present value of minimum obligation $ 164.0    
WYCO Totem Gas Storage Facilities      
Capital Leases [Abstract]      
Ownership interest in joint venture (in hundredths) 50.00%    
Capital lease obligations $ 132.9 138.9  
Gas Storage Facilities      
Property Held Under Capital Leases, Net [Abstract]      
Property held under capital lease 200.5 200.5  
Gas Pipeline      
Property Held Under Capital Leases, Net [Abstract]      
Property held under capital lease 20.7 20.7  
Office Space and Other Equipment      
Operating Leases [Abstract]      
Total expenses under operating lease obligations 130.5 126.2 96.6
Operating Leases, Future Minimum Payments Due [Abstract]      
2016 12.0    
2017 7.8    
2018 7.4    
2019 7.4    
2020 7.4    
Thereafter 39.5    
Purchased Power Agreements      
Operating Leases [Abstract]      
Payments for capacity for PPAs under operating lease obligations 113.5 $ 110.1 $ 79.6
Operating Leases, Future Minimum Payments Due [Abstract]      
2016 [1],[2] 102.2    
2017 [1],[2] 95.8    
2018 [1],[2] 96.0    
2019 [1],[2] 96.9    
2020 [1],[2] 97.7    
Thereafter [1],[2] $ 579.7    
[1] Amounts do not include PPAs accounted for as executory contracts.
[2] PPA operating leases contractually expire through 2032.