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Debt (Narrative) (Details) $ in Millions | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | ---
Dec. 31, 2014 USD ($) | May. 15, 2014 USD ($) | Feb. 08, 2013 USD ($) | Feb. 01, 2012 USD ($) | Nov. 30, 2010 USD ($)
Debt Instrument [Line Items] |  |  |  |  |
Commitment fee percentage | 0.375% |  |  |  |
Letter Of Credit [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Letter of credit, fee percentage | 2.25% |  |  |  |
Senior Secured Credit Facility [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Line of credit facility, aggregate maximum borrowing capacity | $ 1,500.0 |  |  |  |
Senior secured credit facility, amount outstanding | 550.4 |  |  |  |
Total amount available for borrowings, remaining borrowing capacity | 438.8 |  |  |  |
Senior Secured Credit Facility [Member] | Letter Of Credit [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Letters of credit, outstanding amount | $ 10.8 |  |  |  |
Maturity date of debt | Jul. 25, 2019 |  |  |  |
Senior Secured Credit Facility [Member] | Accordion [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Senior secured credit facility, maximum borrowing capacity | $ 300.0 |  |  |  |
Senior Unsecured Notes [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt instrument, principal amount |  |  |  | $ 350.0 |
Debt instrument, percentage of face value |  |  |  | 101.00% |
Debt instrument, effective interest rate |  |  |  | 7.682% |
Seven Point Eight Seventy Five Percentage Senior Unsecured Notes [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Maturity date of debt | Dec. 15, 2018 |  |  |  |
Debt instrument, principal amount |  |  |  | $ 100.0 | $ 250.0
Debt instrument, stated rate |  |  |  |  | 7.875%
Federal Funds Effective Rate [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Interest rate spreads senior secured credit facility | 0.50% |  |  |  |
Eurodollar Rate [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Interest rate spreads senior secured credit facility | 2.25% |  |  |  |
Applicable Margin [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Interest rate spreads senior secured credit facility | 1.25% |  |  |  |
Five Point Seventy Five Percentage Senior Unsecured Notes [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Maturity date of debt | Feb. 15, 2021 |  |  |  |
Debt instrument, principal amount |  |  | $ 350.0 |  |
Debt instrument, stated rate |  |  | 5.75% |  |
Maximum percentage of principal, early debt redemption | 35.00% |  |  |  |
Percentage of the redeemable value of debt on Face amount | 105.75% |  |  |  |
Five Point Six Two Five Percentage Senior Unsecured Notes [Member] [Domain] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Maturity date of debt | Jun. 15, 2024 |  |  |  |
Debt instrument, principal amount |  | $ 350.0 |  |  |
Debt instrument, stated rate |  | 5.625% |  |  |
Maximum percentage of principal, early debt redemption | 35.00% |  |  |  |
Percentage of the redeemable value of debt on Face amount | 105.625% |  |  |  |
CHOPS [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Ownership percentage | 50.00% |  |  |  |
Maximum [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Commitment fee percentage | 0.375% |  |  |  |
Maximum [Member] | Senior Secured Credit Facility [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt instrument covenant, requirement leverage ratio | 1.00 |  |  |  |
Debt instrument covenant, requirement senior secured leverage ratio | 1.00 |  |  |  |
Debt instrument covenant, requirement interest coverage ratio | 1.00 |  |  |  |
Maximum [Member] | Senior Secured Credit Facility [Member] | Letter Of Credit [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Letters of credit, outstanding amount | $ 100.0 |  |  |  |
Maximum [Member] | Federal Funds Effective Rate [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Interest rate spreads senior secured credit facility | 1.00% |  |  |  |
Maximum [Member] | LIBOR Rate [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Interest rate spreads senior secured credit facility | 1.00% |  |  |  |
Maximum [Member] | Eurodollar Rate [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Letter of credit, fee percentage | 2.50% |  |  |  |
Maximum [Member] | Alternate Base Rate [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Letter of credit, fee percentage | 1.50% |  |  |  |
Minimum [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Commitment fee percentage | 0.25% |  |  |  |
Minimum [Member] | Senior Secured Credit Facility [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt instrument covenant, requirement leverage ratio | 5.00 |  |  |  |
Debt instrument covenant, requirement senior secured leverage ratio | 3.75 |  |  |  |
Debt instrument covenant, requirement interest coverage ratio | 3.00 |  |  |  |
Minimum [Member] | Eurodollar Rate [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Letter of credit, fee percentage | 1.50% |  |  |  |
Minimum [Member] | Alternate Base Rate [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Letter of credit, fee percentage | 0.50% |  |  |  |
Amended Facility [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Senior secured credit facility, maximum borrowing capacity | $ 1,000.0 |  |  |  |
Amended Facility [Member] | Senior Secured Credit Facility [Member] | Accordion [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Senior secured credit facility, maximum borrowing capacity | 500.0 |  |  |  |
Petroleum Products [Member] | Senior Secured Credit Facility [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Senior secured credit facility, amount outstanding | 45.0 |  |  |  |
Petroleum Products [Member] | Amended Facility [Member] | Senior Secured Credit Facility [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Senior secured credit facility, maximum borrowing capacity | $ 150.0 |  |  |  |
During Acquisition Period [Member] | Maximum [Member] | Senior Secured Credit Facility [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt instrument covenant, requirement leverage ratio | 1.00 |  |  |  |
Debt instrument covenant, requirement senior secured leverage ratio | 1.00 |  |  |  |
Debt instrument covenant, requirement interest coverage ratio | 1.00 |  |  |  |
During Acquisition Period [Member] | Minimum [Member] | Senior Secured Credit Facility [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt instrument covenant, requirement leverage ratio | 5.50 |  |  |  |
Debt instrument covenant, requirement senior secured leverage ratio | 4.25 |  |  |  |
Debt instrument covenant, requirement interest coverage ratio | 2.75 |  |  |  |

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