Fair Value Disclosure (Details) $ in Millions		12 Months Ended
		Dec. 31, 2018 USD ($) Instrument	Dec. 31, 2017 USD ($) Instrument	Dec. 31, 2016 USD ($)	Sep. 30, 2015
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash Flow Hedge Gain (Loss) to be Reclassified within Twelve Months		$ (3.1)
Derivative, Net Liability Position, Aggregate Fair Value		25.9
Derivative Asset, Notional Amount		500.0	$ 550.0
Asset Impairment Charges		9.0	8.6	$ 38.5
Liabilities
Derivative, Notional Amount		501.9	285.6
Cash Flow Hedge Pre Tax Gain Loss to be Reclassified within Twelve Months		(4.1)
Fair Value, Measurements, Recurring [Member] | Designated as Hedging Instrument [Member]
Assets
Interest rate derivatives	[1]		1.2
Foreign Currency Cash Flow Hedge Asset at Fair Value	[2]	4.4
Liabilities
Interest rate derivatives	[1]	7.7	4.7
Foreign Currency Fair Value Hedge Liability at Fair Value	[2]	18.2
Foreign exchange rate derivatives	[2]		(27.7)
Fair Value, Measurements, Recurring [Member] | Not Designated as Hedging Instrument [Member]
Assets
Foreign Currency Derivative Instruments Not Designated as Hedging Instruments, Asset at Fair Value	[2]	0.5
Liabilities
Foreign exchange rate derivatives	[2]	(4.7)	(6.9)
Fair Value, Inputs, Level 2 [Member] | Fair Value, Measurements, Recurring [Member] | Designated as Hedging Instrument [Member]
Assets
Interest rate derivatives	[1]		1.2
Foreign Currency Cash Flow Hedge Asset at Fair Value	[2]	4.4
Liabilities
Interest rate derivatives	[1]	7.7	4.7
Foreign Currency Fair Value Hedge Liability at Fair Value	[2]	$ 18.2
Foreign exchange rate derivatives	[2]		$ (27.7)
Cash Flow Hedging [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative, Number of Instruments Held | Instrument		8	5
Other Nonoperating Income (Expense) [Member] | Cash Flow Hedging [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Effective portion reclassified from accumulated other comprehensive loss		$ (11.7)	$ 38.9	(11.9)
Other Expense [Member] | Not Designated as Hedging Instrument [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Instruments, Gain (Loss) Recognized in Income, Ineffective Portion and Amount Excluded from Effectiveness Testing, Net		(2.2)	8.0	(2.6)
Cardinal Marine [Domain]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Noncontrolling Interest, Ownership Percentage by Parent					50.00%
Portfolio Management [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Asset Impairment Charges		4.5	3.7	6.7
Changes Measurement [Member] | Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Nonrecurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Asset Impairment Charges		$ 6.0	8.6	2.0
Nordic Vessels [Member] | Changes Measurement [Member] | Portfolio Management [Member] | Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Nonrecurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Asset Impairment Charges			$ 0.0	$ 6.7

[1] (1) Designated as hedges

[2] (2) Not designated as hedges