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Financial Instruments - Derivative Hedging Activities (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Interest expense	$ (98.0)	$ (96.0)	$ (296.9)	$ (287.3)
Realized gain reclassified into earnings	(0.5)		(0.9)
Interest Expense \| Interest Rate Swap
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Gain (Loss) on change in fair value of derivative	0.3		0.5
Interest Expense \| Interest Rate Swap Locks
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Realized gain reclassified into earnings	0.5		0.9
Fair Value Hedging \| Interest Expense \| Interest Rate Swap
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Gain (loss) reclassified from AOCI into earnings		0.3		1.7
Fair Value Hedging \| Other Income \| Interest Rate Swap
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Net periodic earnings	$ 0.3		$ 0.5
Net periodic earnings		(0.2)		(0.4)
Cash Flow Hedging \| Interest Expense \| Interest Rate Swap Locks
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Gain (loss) reclassified from AOCI into earnings		$ 0.0		$ (0.6)