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Stockholders' Equity - Changes in Accumulated Other Comprehensive Income by Component (Details)
$ in Millions
 9 Months Ended
Sep. 30, 2019
USD ($)
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]  
Balance at January 1, 2019 $ 2,672.4
Amounts reclassified from AOCI, net of tax 10.0
Balance at September 30, 2019 3,034.7
Foreign Currency Translation Adjustments  
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]  
Balance at January 1, 2019 (0.4)
Balance at September 30, 2019 (0.4)
Unfunded Employee Benefit Obligations  
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]  
Balance at January 1, 2019 (127.9)
Amounts reclassified from AOCI, net of tax 7.1
Balance at September 30, 2019 (120.8)
Accumulated Other Comprehensive Loss  
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]  
Balance at January 1, 2019 (138.8)
Amounts reclassified from AOCI, net of tax 10.0
Balance at September 30, 2019 (128.8)
Treasury Lock | Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges  
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]  
Balance at January 1, 2019 (10.2)
Amounts reclassified from AOCI, net of tax 2.9
Balance at September 30, 2019 (7.3)
Foreign Exchange Contract | Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges  
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]  
Balance at January 1, 2019 (0.3)
Balance at September 30, 2019 $ (0.3)