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Stockholders' Equity - Reclassifications from Accumulated Other Comprehensive Loss (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Income tax benefit $ 10.2 $ 5.7 $ 18.6 $ 9.9
Reclassification out of Accumulated Other Comprehensive Income        
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Amortization of actuarial loss (2.0) (1.4) (3.8) (2.7)
Income tax benefit 0.7 0.6 1.4 1.0
Total reclassifications for the period, net of tax (1.3) (0.8) (2.4) (1.7)
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]        
Amortization of actuarial loss $ (2.0) $ (1.4) $ (3.8) $ (2.7)