Long-Term Debt (Narrative) (Details) (USD $)
In Millions, unless otherwise specified |
12 Months Ended | ||
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Dec. 31, 2013
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Dec. 31, 2012
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Dec. 31, 2011
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Long-term Debt Types [Abstract] | |||
Annual Facility Fee | 0.225% | ||
Debt Required Payments Start Date | Jan. 01, 2015 | ||
Proceeds from Issuance of Debt | $ 0 | $ 0 | $ 100.0 |
Bonds Face Amount | 43.0 | ||
Undrawn Letters of Credit | 137.0 | ||
October 2014 Multi-currency Facility [Member]
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Long-term Debt Types [Abstract] | |||
Debt Due Date | Oct. 01, 2014 | ||
Credit Facility Availble Borrowing Credit | 30.0 | ||
Revolving Facility [Member]
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Long-term Debt Types [Abstract] | |||
Unsecured notes outstanding | 120.6 | 107.2 | |
Amended Revolving Facility [Member]
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Long-term Debt Types [Abstract] | |||
Debt Issuance or Start Date | Jan. 06, 2012 | ||
Credit Facility Borrowing Capacity | 480.0 | ||
Debt Due Date | Jan. 01, 2017 | ||
Credit Facility Availble Borrowing Credit | 359.0 | ||
Amended Revolving Facility [Member] | Libor [Member]
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Long-term Debt Types [Abstract] | |||
Margin on Base Rate | 1.40% | ||
Amended Revolving Facility [Member] | Minimum [Member]
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Long-term Debt Types [Abstract] | |||
Annual Facility Fee | 0.10% | ||
Amended Revolving Facility [Member] | Minimum [Member] | Libor [Member]
|
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Long-term Debt Types [Abstract] | |||
Margin on Base Rate | 0.90% | ||
Amended Revolving Facility [Member] | Minimum [Member] | Alternate Base Rate [Member]
|
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Long-term Debt Types [Abstract] | |||
Margin on Base Rate | 0.00% | ||
Amended Revolving Facility [Member] | Maximum [Member]
|
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Long-term Debt Types [Abstract] | |||
Annual Facility Fee | 0.30% | ||
Amended Revolving Facility [Member] | Maximum [Member] | Libor [Member]
|
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Long-term Debt Types [Abstract] | |||
Margin on Base Rate | 1.575% | ||
Amended Revolving Facility [Member] | Maximum [Member] | Alternate Base Rate [Member]
|
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Long-term Debt Types [Abstract] | |||
Margin on Base Rate | 0.575% | ||
Private Placement Notes [Member]
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Long-term Debt Types [Abstract] | |||
Debt Due Date | Jan. 01, 2021 | ||
Proceeds from Issuance of Debt | 100.0 | ||
Private Placement Notes [Member] | Private Placement Notes Seriesa [Member]
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Long-term Debt Types [Abstract] | |||
Unsecured notes outstanding | 50.0 | ||
Private Placement Notes [Member] | Private Placement Notes Series B [Member]
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Long-term Debt Types [Abstract] | |||
Unsecured notes outstanding | 50.0 | ||
Unsecured Multi-currency Debt Facilities [Member]
|
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Long-term Debt Types [Abstract] | |||
Credit Facility Borrowing Capacity | 73.0 | ||
Credit Facility Availble Borrowing Credit | 46.0 | ||
Undrawn Letters of Credit | 21.0 | ||
Unsecured Multi-currency Debt Facilities [Member] | December 2012 Multi-currency Facility [Member]
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Long-term Debt Types [Abstract] | |||
Debt Due Date | Dec. 01, 2015 | ||
Credit Facility Availble Borrowing Credit | 23.0 | ||
Unsecured Multi-currency Debt Facilities [Member] | May 2014 Multi-currency Facility [Member]
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Long-term Debt Types [Abstract] | |||
Debt Due Date | May 01, 2014 | ||
Credit Facility Availble Borrowing Credit | 20.0 | ||
Unsecured Multi-currency Debt Facilities [Member] | Minimum [Member]
|
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Long-term Debt Types [Abstract] | |||
Margin on Base Rate | 0.90% | ||
Unsecured Multi-currency Debt Facilities [Member] | Maximum [Member]
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Long-term Debt Types [Abstract] | |||
Margin on Base Rate | 2.125% | ||
Unsecured Letter of Credit Facilities [Member]
|
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Long-term Debt Types [Abstract] | |||
Credit Facility Borrowing Capacity | 179.0 | ||
Credit Facility Availble Borrowing Credit | 70.0 | ||
Undrawn Letters of Credit | 109.0 | ||
Unsecured Letter of Credit Facilities [Member] | Fifty Four Million Unsecured Letter of Credit Facility [Member]
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Long-term Debt Types [Abstract] | |||
Debt Due Date | Dec. 01, 2016 | ||
Credit Facility Availble Borrowing Credit | 54.0 | ||
Unsecured Letter of Credit Facilities [Member] | Eighty Five Million Unsecured Letter of Credit Facility [Member]
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Long-term Debt Types [Abstract] | |||
Debt Due Date | Jun. 01, 2015 | ||
Credit Facility Availble Borrowing Credit | 85.0 | ||
Unsecured Letter of Credit Facilities [Member] | Twenty Four Million Unsecured Letter of Credit Facility [Member]
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Long-term Debt Types [Abstract] | |||
Debt Due Date | Dec. 01, 2015 | ||
Credit Facility Availble Borrowing Credit | 40.0 | ||
Unsecured Bilateral Commited Credit Facilities [Member]
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Long-term Debt Types [Abstract] | |||
Credit Facility Borrowing Capacity | 24.0 | ||
Debt Due Date | Apr. 01, 2014 | ||
Credit Facility Availble Borrowing Credit | 14.0 | ||
Unsecured Bilateral Commited Credit Facilities [Member] | Minimum [Member]
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Long-term Debt Types [Abstract] | |||
Margin on Base Rate | 1.20% | ||
Unsecured Bilateral Commited Credit Facilities [Member] | Maximum [Member]
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Long-term Debt Types [Abstract] | |||
Margin on Base Rate | 1.575% | ||
Dominion Terminal Associates Bonds [Member]
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Long-term Debt Types [Abstract] | |||
Debt Due Date | Jan. 01, 2033 | ||
Other Credit Facilities [Member]
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Long-term Debt Types [Abstract] | |||
Undrawn Letters of Credit | $ 7.1 |