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Financial Instruments - Derivative Hedging Activities (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Derivative Instruments and Hedging Activities Disclosures [Line Items]    
Interest expense $ (96.6) $ (100.4)
Gain on fair value hedging relationships:    
Net periodic earnings 0.7 0.1
Realized gain reclassified into earnings 0.8 (0.1)
Interest Expense | Interest Rate Swap    
Gain on fair value hedging relationships:    
Net swap settlements 0.7 0.1
Net periodic earnings 0.6 0.0
Interest Expense | Interest Rate Swap Locks    
Gain on fair value hedging relationships:    
Realized gain reclassified into earnings (0.8) 0.1
Interest Expense | Interest rate contract    
Loss on free-standing derivative instruments:    
Net loss on change in fair value of free-standing derivative instruments $ (2.6) $ 0.0