Fair Value Disclosure (Details) (USD $) In Millions, unless otherwise specified	Jun. 30, 2013		Dec. 31, 2012
Assets
Available for sale equity securities	$ 3.8		$ 3.3
Designated as Hedging Instrument [Member]
Assets
Interest rate derivatives	8.1	[1]	10.2	[1]
Liabilities
Interest rate derivatives	0.1	[1]	1.0	[1]
Not Designated as Hedging Instrument [Member]
Assets
Foreign exchange rate derivatives	0.3	[2]
Liabilities
Interest rate derivatives	0.3	[2]	0.3	[2]
Foreign exchange rate derivatives			2.1	[2]
Fair Value, Inputs, Level 1 [Member] | Fair Value, Measurements, Recurring [Member]
Assets
Available for sale equity securities	3.8		3.3
Fair Value, Inputs, Level 1 [Member] | Fair Value, Measurements, Recurring [Member] | Designated as Hedging Instrument [Member]
Assets
Interest rate derivatives	0	[1]	0	[1]
Liabilities
Interest rate derivatives	0	[1]	0	[1]
Fair Value, Inputs, Level 1 [Member] | Fair Value, Measurements, Recurring [Member] | Not Designated as Hedging Instrument [Member]
Assets
Foreign exchange rate derivatives	0	[2]
Liabilities
Interest rate derivatives	0	[2]	0	[2]
Foreign exchange rate derivatives			0	[2]
Fair Value, Inputs, Level 2 [Member] | Fair Value, Measurements, Recurring [Member]
Assets
Available for sale equity securities	0		0
Fair Value, Inputs, Level 2 [Member] | Fair Value, Measurements, Recurring [Member] | Designated as Hedging Instrument [Member]
Assets
Interest rate derivatives	8.1	[1]	10.2	[1]
Liabilities
Interest rate derivatives	0.1	[1]	1.0	[1]
Fair Value, Inputs, Level 2 [Member] | Fair Value, Measurements, Recurring [Member] | Not Designated as Hedging Instrument [Member]
Assets
Foreign exchange rate derivatives	0.3	[2]
Liabilities
Interest rate derivatives	0.3	[2]	0.3	[2]
Foreign exchange rate derivatives			2.1	[2]
Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Recurring [Member]
Assets
Available for sale equity securities	0		0
Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Recurring [Member] | Designated as Hedging Instrument [Member]
Assets
Interest rate derivatives	0	[1]	0	[1]
Liabilities
Interest rate derivatives	0	[1]	0	[1]
Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Recurring [Member] | Not Designated as Hedging Instrument [Member]
Assets
Foreign exchange rate derivatives	0	[2]
Liabilities
Interest rate derivatives	0	[2]	0	[2]
Foreign exchange rate derivatives			$ 0	[2]

[1] Designated as hedges

[2] Not designated as hedges