Pension Benefits - Changes in Fair Value of Pension Plans Level 3 (Details) (Pension Plans, Defined Benefit [Member], USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Transfers out of Level 3		$ (1.0)
Fair Value of Plan Assets at End of Year	524.5	457.6
Fair Value, Inputs, Level 3 [Member]
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair Value of Plan Assets at Beginning of Year	27.5	41.4
Return on Plan Assets Still Held	3.5	1.8
Purchases, Sales and Settlements, Net	16.4	(14.7)
Fair Value of Plan Assets at End of Year	47.4	27.5
Corporate Bonds [Member] | Fair Value, Inputs, Level 3 [Member]
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair Value of Plan Assets at Beginning of Year		1.0
Return on Plan Assets Still Held		0
Purchases, Sales and Settlements, Net		0
Transfers out of Level 3		(1.0)
Fair Value of Plan Assets at End of Year		0
Other Equity Interests [Member] | Fair Value, Inputs, Level 3 [Member]
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair Value of Plan Assets at Beginning of Year	26.9	37.2
Return on Plan Assets Still Held	3.5	1.7
Purchases, Sales and Settlements, Net	16.5	(12.0)
Transfers out of Level 3		0
Fair Value of Plan Assets at End of Year	46.9	26.9
Receivables and Other [Member]
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair Value of Plan Assets at End of Year	2.8	3.1
Receivables and Other [Member] | Fair Value, Inputs, Level 3 [Member]
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair Value of Plan Assets at Beginning of Year	0.6	3.2
Return on Plan Assets Still Held	0	0.1
Purchases, Sales and Settlements, Net	(0.1)	(2.7)
Transfers out of Level 3		0
Fair Value of Plan Assets at End of Year	$ 0.5	$ 0.6