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Changes in Accumulated Other Comprehensive Loss by Component - Summary of Reclassifications Out of AOCI (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2022
Mar. 31, 2022
Jun. 30, 2021
Mar. 31, 2021
Jun. 30, 2022
Jun. 30, 2021
Loss on cash flow hedges:            
Interest expense $ (94.0)   $ (78.4)   $ (177.5) $ (156.7)
Tax benefit (106.3)   (95.4)   (226.6) (199.1)
Pension gains:            
Tax expense (106.3)   (95.4)   (226.6) (199.1)
Net of tax 371.8 $ 351.9 332.0 $ 296.4 723.7 628.4
Amount Reclassified from Accumulated Other Comprehensive Income            
Pension gains:            
Net of tax (1.1)   (0.5)   (2.2) (1.6)
Amount Reclassified from Accumulated Other Comprehensive Income | Cash Flow Hedges            
Loss on cash flow hedges:            
Total before tax (1.5)   (1.6)   (3.0) (3.1)
Tax benefit 0.4   0.4   0.8 0.8
Pension gains:            
Tax expense 0.4   0.4   0.8 0.8
Net of tax (1.1)   (1.2)   (2.2) (2.3)
Amount Reclassified from Accumulated Other Comprehensive Income | Cash Flow Hedges | Terminated interest rate locks            
Loss on cash flow hedges:            
Interest expense (1.5)   (1.6)   (3.0) (3.1)
Amount Reclassified from Accumulated Other Comprehensive Income | Cash Flow Hedges | 2022 Interest Rate Swap            
Loss on cash flow hedges:            
Interest expense 0.0   0.0   0.0 0.0
Amount Reclassified from Accumulated Other Comprehensive Income | Defined Benefit Pension Items | Pension settlement            
Loss on cash flow hedges:            
Tax benefit 0.0   (0.2)   0.0 (0.2)
Pension gains:            
Other income 0.0   0.9   0.0 0.9
Tax expense 0.0   (0.2)   0.0 (0.2)
Net of tax $ 0.0   $ 0.7   $ 0.0 $ 0.7