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Fair Value Measurements Fair Value Measurements - Fair Value and Related Carrying Amount of Certain Financial Instruments (Details) (USD $) In Millions, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014	Mar. 31, 2014	Dec. 31, 2013
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and Cash Equivalents, at Carrying Value	$ 500.4	$ 1,160.1	$ 3.9	$ 11.9
Checks outstanding in excess of cash balances	15.8us-gaap_BankOverdrafts	54.7us-gaap_BankOverdrafts
Estimate of Fair Value Measurement [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term Debt, Fair Value	2,248.5	2,171.6
Cash and Cash Equivalents, at Carrying Value	500.4	1,160.1
Checks outstanding in excess of cash balances	15.8	54.7
Reported Value Measurement [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term Debt, Fair Value	2,218.3	2,218.1
Cash and Cash Equivalents, at Carrying Value	500.4	1,160.1
Checks outstanding in excess of cash balances	$ 15.8	$ 54.7

Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation.

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