Employee Benefit Plans US Changes in Assets measured at fair value using significant unobservable inputs (Details) (Fair Value, Inputs, Level 3, Pension Benefits, U.S. Plans, USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value	$ 103.7	$ 84.8	$ 68.0
Defined Benefit Plan, Actual Return on Plan Assets Still Held	7.5	4.3
Defined Benefit Plan, Actual Return on Plan Assets Sold During Period	1.1	1.0
Purchases	15.4	17.8
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales	(5.1)	(6.3)
Level 3 Transfers Into	0	0
Level 3 Transfers Out of	0	0
PrivateEquityDirectInvestment [Domain]
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value	7.2	0
Defined Benefit Plan, Actual Return on Plan Assets Still Held	0.3
Defined Benefit Plan, Actual Return on Plan Assets Sold During Period	0
Purchases	8.4
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales	(1.5)
Level 3 Transfers Into	0
Level 3 Transfers Out of	0
Hedge Funds [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value	66.9	56.1	44.3
Defined Benefit Plan, Actual Return on Plan Assets Still Held	6.3	3.8
Defined Benefit Plan, Actual Return on Plan Assets Sold During Period	0	0
Purchases	4.9	11.8
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales	(0.4)	(3.8)
Level 3 Transfers Into	0	0
Level 3 Transfers Out of	0	0
Private Equity Funds
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value	29.6	28.7	23.7
Defined Benefit Plan, Actual Return on Plan Assets Still Held	0.9	0.5
Defined Benefit Plan, Actual Return on Plan Assets Sold During Period	1.1	1.0
Purchases	2.1	6.0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales	(3.2)	(2.5)
Level 3 Transfers Into	0	0
Level 3 Transfers Out of	$ 0	$ 0