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Accumulated Other Comprehensive Loss - Additional Information (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2017
Unrecognized Net Defined Benefit and Postretirement Plan Costs    
Accumulated Other Comprehensive Income Loss [Line Items]    
Reclassification adjustment from AOCI on unrecognized net defined benefit and postretirement plan costs, net gains   $ 0.3
Reclassification adjustment from AOCI on unrecognized net defined benefit and postretirement plan costs, tax   0.1
Change in Fair Value of Derivatives Products    
Accumulated Other Comprehensive Income Loss [Line Items]    
Reclassification adjustment from AOCI on derivatives, net losses $ 4.0 10.4
Reclassification adjustment from AOCI on derivatives, tax benefit $ 0.8 $ 2.4