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Accumulated Other Comprehensive Loss (Components Of Accumulated Other Comprehensive Loss) (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning Balance $ (156.3) $ (44.4) $ (35.1) $ (50.6)
Other Comprehensive Income before reclassifications (23.2) (1.0) (145.7) 1.3
Amounts reclassified from accumulated other comprehensive loss 0.5 1.3 1.8 3.2
Net current-period other comprehensive income (loss) (22.7) 0.3 (143.9) 4.5
Allocation of AOCI to Noncontrolling Interest       2.0
Distribution of CPG to shareholders (Refer to Note 4, Discontinued Operations)   24.5   24.5
Ending Balance (179.0) (19.6) (179.0) (19.6)
Gains and Losses on Securities        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning Balance 2.0 0.0 (0.5) 0.3
Other Comprehensive Income before reclassifications (0.3) 0.5 2.3 0.3
Amounts reclassified from accumulated other comprehensive loss 0.0 (0.2) (0.1) (0.3)
Net current-period other comprehensive income (loss) (0.3) 0.3 2.2 0.0
Allocation of AOCI to Noncontrolling Interest       0.0
Distribution of CPG to shareholders (Refer to Note 4, Discontinued Operations)   0.0   0.0
Ending Balance 1.7 0.3 1.7 0.3
Gains and Losses on Cash Flow Hedges        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning Balance (139.7) (20.0) (15.5) (23.6)
Other Comprehensive Income before reclassifications (22.9) (0.2) (148.0) (0.2)
Amounts reclassified from accumulated other comprehensive loss 0.3 0.4 1.2 2.0
Net current-period other comprehensive income (loss) (22.6) 0.2 (146.8) 1.8
Allocation of AOCI to Noncontrolling Interest       2.0
Distribution of CPG to shareholders (Refer to Note 4, Discontinued Operations)   13.9   13.9
Ending Balance (162.3) (5.9) (162.3) (5.9)
Pension and OPEB Items        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning Balance (18.6) (24.4) (19.1) (27.3)
Other Comprehensive Income before reclassifications 0.0 (1.3) 0.0 1.2
Amounts reclassified from accumulated other comprehensive loss 0.2 1.1 0.7 1.5
Net current-period other comprehensive income (loss) 0.2 (0.2) 0.7 2.7
Allocation of AOCI to Noncontrolling Interest       0.0
Distribution of CPG to shareholders (Refer to Note 4, Discontinued Operations)   10.6   10.6
Ending Balance $ (18.4) $ (14.0) $ (18.4) $ (14.0)