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Stockholders' Equity Reclassifications from Accumulated Other Comprehensive Loss (Details) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]          
Income tax benefit $ (1.4) $ (3.5) $ 34.1 $ 23.7 $ (108.6)
Total reclassifications for the period, net of tax     (4.8) (2.9)  
Reclassification out of Accumulated Other Comprehensive Income          
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]          
Actuarial (gain) loss     (7.4) (5.3)  
Income tax benefit     2.6 2.4  
Total reclassifications for the period, net of tax     (4.8) (2.9)  
Selling, General and Administrative Expenses | Reclassification out of Accumulated Other Comprehensive Income          
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]          
Actuarial (gain) loss     0.1 0.2  
Accumulated Defined Benefit Plans Adjustment, Net Unamortized Gain (Loss) | Reclassification out of Accumulated Other Comprehensive Income          
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]          
Actuarial (gain) loss     $ 7.5 $ 5.5