Pension and Postretirement Plans Projected Benefit Obligation (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets at December 31,	$ 410.6	$ 355.5
Pension Plan, Defined Benefit [Member]
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Benefit obligation at January 1,	584.9	569.2
Service cost	2.1	2.6	5.1
Interest Cost	18.8	21.3	24.8
Prior service credit	0	0
Actuarial (gain) loss	(38.2)	30.6
Benefits paid	(44.6)	(38.8)
Retiree drug subsidy received	0	0
Early retiree subsidy refunded	0	0
Other	0	0
Benefit obligation at December 31,	523.0	584.9	569.2
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets at January 1,	343.8	312.5
Actual return on plan assets	55.1	44.2
Employer contributions	45.0	25.9
Retiree drug subsidy received	0	0
Early retiree subsidy refunded	0	0
Benefits paid	(44.6)	(38.8)
Fair value of plan assets at December 31,	399.3	343.8	312.5
Unfunded status	(123.7)	(241.1)
Other Postretirement Benefit Plan, Defined Benefit [Member]
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Benefit obligation at January 1,	152.4	164.9
Service cost	0.4	0.5	0.3
Interest Cost	4.0	5.6	7.1
Prior service credit	(17.4)	0
Actuarial (gain) loss	(19.6)	2.2
Benefits paid	(23.9)	(26.0)
Retiree drug subsidy received	0.5	0.6
Early retiree subsidy refunded	0	(0.1)
Other	5.1	4.7
Benefit obligation at December 31,	101.5	152.4	164.9
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets at January 1,	11.7	12.1
Actual return on plan assets	0.4	0.4
Employer contributions	22.6	24.7
Retiree drug subsidy received	0.5	0.6
Early retiree subsidy refunded	0	(0.1)
Benefits paid	(23.9)	(26.0)
Fair value of plan assets at December 31,	11.3	11.7	12.1
Unfunded status	$ (90.2)	$ (140.7)