Fair Value - Recurring Fair Value Measures (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2014		Mar. 31, 2013	Dec. 31, 2013
Investments [Abstract]
Cash Equivalents	$ 3.9	[1]		$ 34.2	[1]
Fair Value [Abstract]
Fair Value Activity in Level 3	0		0
Fair Value Hierarchy Transfers, All Levels	0		0
Recurring Fair Value Measurements [Member]
Investments [Abstract]
Available-for-sale - Equity Securities	9.8	[2]		7.9	[2]
Available-for-sale - Corporate Debt Securities	10.0	[2]		9.8	[2]
Cash Equivalents	3.9	[2]		34.2	[2]
Total Fair Value of Assets	23.7			51.9
Liabilities [Abstract]
Deferred Compensation	18.7	[3]		16.8	[3]
Derivatives - Interest Rate Swap	0.5	[4]		0.6	[4]
Total Fair Value of Liabilities	19.2			17.4
Total Net Fair Value of Assets (Liabilities)	4.5			34.5
Recurring Fair Value Measurements [Member] | Level 1 [Member]
Investments [Abstract]
Available-for-sale - Equity Securities	9.8	[2]		7.9	[2]
Available-for-sale - Corporate Debt Securities	0	[2]		0	[2]
Cash Equivalents	3.9	[2]		34.2	[2]
Total Fair Value of Assets	13.7			42.1
Liabilities [Abstract]
Deferred Compensation	0	[3]		0	[3]
Derivatives - Interest Rate Swap	0	[4]		0	[4]
Total Fair Value of Liabilities	0			0
Total Net Fair Value of Assets (Liabilities)	13.7			42.1
Recurring Fair Value Measurements [Member] | Level 2 [Member]
Investments [Abstract]
Available-for-sale - Equity Securities	0	[2]		0	[2]
Available-for-sale - Corporate Debt Securities	10.0	[2]		9.8	[2]
Cash Equivalents	0	[2]		0	[2]
Total Fair Value of Assets	10.0			9.8
Liabilities [Abstract]
Deferred Compensation	18.7	[3]		16.8	[3]
Derivatives - Interest Rate Swap	0.5	[4]		0.6	[4]
Total Fair Value of Liabilities	19.2			17.4
Total Net Fair Value of Assets (Liabilities)	(9.2)			(7.6)
Recurring Fair Value Measurements [Member] | Level 3 [Member]
Investments [Abstract]
Available-for-sale - Equity Securities	0	[2]		0	[2]
Available-for-sale - Corporate Debt Securities	0	[2]		0	[2]
Cash Equivalents	0	[2]		0	[2]
Total Fair Value of Assets	0			0
Liabilities [Abstract]
Deferred Compensation	0	[3]		0	[3]
Derivatives - Interest Rate Swap	0	[4]		0	[4]
Total Fair Value of Liabilities	0			0
Total Net Fair Value of Assets (Liabilities)	$ 0			$ 0

[1] During the quarter ended March 31, 2014, cash included in Other Investments was transferred to Cash and Cash Equivalents.

[2] Included in Other Investments on the Consolidated Balance Sheet.

[3] Included in Other Non-Current Liabilities on the Consolidated Balance Sheet.

[4] Included in Current Liabilities - Other and Other Non-Current Liabilities on the Consolidated Balance Sheet.