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Accumulated Other Comprehensive Loss (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Accumulated Other Comprehensive Income Loss Line Items        
Accumulated Other Comprehensive Income (Loss), Net of Tax     $ (297.3) $ (0.4)
Other Comprehensive Income (Loss) Assumed from Separation       (237.1)
Other comprehensive income before reclassifications, before income tax     (0.6) 0.5
Amounts reclassified from accumulated other comprehensive income, before income tax     26.7 12.0
Income tax benefit     (10.0) (4.3)
Net current period other comprehensive income, net of income tax $ 5.0 $ 4.9 16.1 8.2
Accumulated Other Comprehensive Income (Loss), Net of Tax (281.2) (229.3) (281.2) (229.3)
Accumulated Translation Adjustment [Member]        
Accumulated Other Comprehensive Income Loss Line Items        
Accumulated Other Comprehensive Income (Loss), Net of Tax     (4.8) (0.4)
Other Comprehensive Income (Loss) Assumed from Separation       (3.2)
Other comprehensive income before reclassifications, before income tax     (1.1) (0.2)
Amounts reclassified from accumulated other comprehensive income, before income tax     0.0 0.0
Income tax benefit     0.0 0.0
Net current period other comprehensive income, net of income tax     (1.1) (0.2)
Accumulated Other Comprehensive Income (Loss), Net of Tax (5.9) (3.8) (5.9) (3.8)
Accumulated Defined Benefit Plans Adjustment [Member]        
Accumulated Other Comprehensive Income Loss Line Items        
Accumulated Other Comprehensive Income (Loss), Net of Tax     (292.5) 0.0
Other Comprehensive Income (Loss) Assumed from Separation       (233.9)
Other comprehensive income before reclassifications, before income tax     0.5 0.7
Amounts reclassified from accumulated other comprehensive income, before income tax     26.7 12.0
Income tax benefit     (10.0) (4.3)
Net current period other comprehensive income, net of income tax     17.2 8.4
Accumulated Other Comprehensive Income (Loss), Net of Tax $ (275.3) $ (225.5) $ (275.3) $ (225.5)