Fair Value Measurements - Table 1 (Details) (Restricted Marketable Securities [Member], USD $) In Millions, unless otherwise specified	9 Months Ended	12 Months Ended
	Sep. 30, 2014	Dec. 31, 2013
Other Current Assets [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Abstract]
Restricted Marketable Securities, Fair Value	$ 4.3	$ 4.7
Fair Value Measurements, Valuation Techniques	M	M
Other Current Assets [Member] | Fair Value, Inputs, Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Abstract]
Restricted Marketable Securities, Fair Value	0	0
Other Current Assets [Member] | Fair Value, Inputs, Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Abstract]
Restricted Marketable Securities, Fair Value	4.3	4.7
Other Current Assets [Member] | Fair Value, Inputs, Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Abstract]
Restricted Marketable Securities, Fair Value	0	0
Other Long-term Assets [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Abstract]
Restricted Marketable Securities, Fair Value	45.9	42.9
Fair Value Measurements, Valuation Techniques	M	M
Other Long-term Assets [Member] | Fair Value, Inputs, Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Abstract]
Restricted Marketable Securities, Fair Value	0	0
Other Long-term Assets [Member] | Fair Value, Inputs, Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Abstract]
Restricted Marketable Securities, Fair Value	45.9	42.9
Other Long-term Assets [Member] | Fair Value, Inputs, Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Abstract]
Restricted Marketable Securities, Fair Value	$ 0	$ 0