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Accumulated Other Comprehensive (Loss) (Reclassification out of Accumulated Other Comprehensive Income) (Parenthetical) (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]        
Tax expense from discontinued operations $ 0.0 $ 0.0 $ 0.0 $ 0.1
Derivative Adjustments [Member] | Reclassified From Accumulated Other Comprehensive Loss [Member]        
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]        
Income tax expense       (0.3)
Pension And Postretirement Adjustments [Member] | Reclassified From Accumulated Other Comprehensive Loss [Member]        
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]        
Tax expense from discontinued operations       $ 1.5