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Fair Value Measurements Fair Value on a Nonrecurring Basis (Details) (USD $) In Millions, unless otherwise specified | Mar. 31, 2012
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Level 1 |
Fair value assets and liabilities measured on recurring and nonrecurring basis |
Total Long-term Debt, Fair Value | $ 0
Level 2 |
Fair value assets and liabilities measured on recurring and nonrecurring basis |
Total Long-term Debt, Fair Value | 1,542.4
Level 3 |
Fair value assets and liabilities measured on recurring and nonrecurring basis |
Total Long-term Debt, Fair Value | 64.5
Fair Value, Total |
Fair value assets and liabilities measured on recurring and nonrecurring basis |
Total Long-term Debt, Fair Value | $ 1,606.9

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- Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition The fair value amount of long-term debt whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant