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Financial Instruments - Derivative Hedging Activities (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Derivative Instruments and Hedging Activities Disclosures [Line Item]    
Interest expense $ (100.4) $ (94.8)
Realized gain reclassified into earnings (0.1)  
Interest Expense | Interest Rate Swap    
Derivative Instruments and Hedging Activities Disclosures [Line Item]    
Realized gain reclassified into earnings 0.1  
Interest Expense | Interest Rate Locks    
Derivative Instruments and Hedging Activities Disclosures [Line Item]    
Realized gain reclassified into earnings $ 0.1  
Cash Flow Hedging | Interest Expense | Interest Rate Locks    
Derivative Instruments and Hedging Activities Disclosures [Line Item]    
Gain (loss) reclassified from AOCI into earnings   (0.5)
Fair Value Hedging | Interest Expense | Interest Rate Swap    
Derivative Instruments and Hedging Activities Disclosures [Line Item]    
Gain (loss) reclassified from AOCI into earnings   $ 0.9