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Changes in Accumulated Other Comprehensive Income by Component - Summary of Reclassifications Out of AOCI (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Reclassifications out of Accumulated Other Comprehensive Income [Line Items]    
Interest expense $ (96.6) $ (100.4)
Tax expense (75.8) (77.9)
Total gains reclassified into earnings (0.8) 0.1
Cash Flow Hedge    
Reclassifications out of Accumulated Other Comprehensive Income [Line Items]    
Total gains reclassified into earnings (0.8)  
Amount Reclassified from Accumulated Other Comprehensive Income | Cash Flow Hedge    
Reclassifications out of Accumulated Other Comprehensive Income [Line Items]    
Total before tax (1.1) 0.1
Tax expense 0.3 0.0
Amount Reclassified from Accumulated Other Comprehensive Income | Cash Flow Hedge | Terminated interest rate locks    
Reclassifications out of Accumulated Other Comprehensive Income [Line Items]    
Interest expense $ (1.1) $ 0.1