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Fair Value Measurements - Schedule of Fair Values of Financial Liabilities (Details) (USD $) In Millions, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Liabilities:
Fair Value, Long-term debt, including current portion	$ 1,856.5us-gaap_LongTermDebtFairValue	$ 1,844.0us-gaap_LongTermDebtFairValue
Carrying Value, Long-term debt, including current portion	1,837.8us-gaap_LongTermDebt	1,863.9us-gaap_LongTermDebt
Level 1
Liabilities:
Fair Value, Long-term debt, including current portion	0	0
Level 2
Liabilities:
Fair Value, Long-term debt, including current portion	1,856.5	1,844.0
Level 3
Liabilities:
Fair Value, Long-term debt, including current portion	$ 0	$ 0

Carrying amount of long-term debt, net of unamortized discount or premium, including current and noncurrent amounts. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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