Employee Benefits (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013 employee	Dec. 31, 2012	Dec. 31, 2011
Compensation and Retirement Disclosure [Abstract]
Number of employees sponsored by defined benefit pension plans	14,000
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Benefit obligation at beginning of year	$ 1,345.7	$ 1,166.2
Service cost	4.3	3.9	3.6
Interest cost	56.2	59.3	61.2
Benefits paid	(76.5)	(63.1)
Actuarial loss	(131.6)	192.1
Expenses paid from assets	(9.6)	(12.7)
Other	0.3	0
Benefit obligation at year end	1,188.8	1,345.7	1,166.2
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets at prior year end	799.4	727.7
Actual return on plan assets	31.9	72.2
Employer contributions	62.9	75.3
Benefits paid	(76.5)	(63.1)
Expenses paid from assets	(9.6)	(12.7)
Other	0.3	0
Fair value of plan assets at year end	808.4	799.4	727.7
Funded status at year end	(380.4)	(546.3)
Noncurrent assets	1.7	0
Current liabilities	0.6	0.6
Noncurrent liabilities	381.5	545.7
Net actuarial loss	389.2	511.8
Unrecognized actuarial losses net of tax	338.4
Actuarial loss included in accumulated other comprehensive income and expected to be recognized next year	$ 12.6