Pension and Other Postretirement Benefit Plans - Obligation and Funded Status (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013		Dec. 31, 2012		Dec. 31, 2011
Change in Plan Assets [Roll Forward]
Non-Current Liabilities	$ (133.4)		$ (228.2)
Pension [Member]
Defined Benefit Plan Disclosure [Line Items]
Accumulated Benefit Obligation	577.6		598.7
Change in Benefit Obligation [Roll Forward]
Obligation, Beginning of Year	652.1		597.5
Service Cost	9.9		9.1		7.6
Interest Cost	26.0		26.4		27.4
Actuarial (Gain) Loss	(49.2)		38.5
Benefits Paid	(33.5)		(30.9)
Participant Contributions	17.5		11.5
Obligation, End of Year	622.8		652.1		597.5
Change in Plan Assets [Roll Forward]
Fair Value, Beginning of Year	460.1		432.4
Actual Return on Plan Assets	56.5		38.7
Employer Contribution	18.5	[1]	19.9	[1]
Fair Value, End of Year	501.6		460.1		432.4
Funded Status, End of Year	(121.2)		(192.0)
Current Liabilities	(1.1)		(1.1)
Non-Current Liabilities	(120.1)		(190.9)
Postretirement Health and Life [Member]
Change in Benefit Obligation [Roll Forward]
Obligation, Beginning of Year	168.8		210.6
Service Cost	3.9		4.2		3.8
Interest Cost	6.8		9.4		10.8
Actuarial (Gain) Loss	(18.8)		(43.2)
Benefits Paid	(9.9)		(9.5)
Participant Contributions	2.7		2.6
Plan Amendments	0		(5.3)
Settlements	(1.6)	[2]	0
Obligation, End of Year	151.9		168.8		210.6
Change in Plan Assets [Roll Forward]
Fair Value, Beginning of Year	131.0		121.0
Actual Return on Plan Assets	21.4		14.3
Employer Contribution	11.7		2.3
Participant Contributions, Excluding Key Employees	2.7		2.5
Benefits Paid, Excluding Key Employees	(9.8)		(9.1)
Fair Value, End of Year	157.0		131.0		121.0
Funded Status, End of Year	5.1		(37.8)
Non-Current Assets	19.4		0
Current Liabilities	(0.9)		(0.8)
Non-Current Liabilities	(13.4)		(37.0)
Grantor Trust [Member]
Change in Plan Assets [Roll Forward]
Other Investments, Grantor Trust	$ 17.8		$ 22.1

[1] Includes participant contributions noted above.

[2] Result of the exit from a legacy benefit plan.