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Derivatives (Details) (USD $) In Millions, unless otherwise specified | 3 Months Ended
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Jun. 30, 2013
Swap Agreement One |  |
Swaps: |  |
Original variable, rate debt amount | $ 50.0 |
Agreement date | Jun. 21, 2006 |
Effective date | Jul. 10, 2006 |
Expiration date | Jul. 10, 2013 |
Designed cash flow hedge date | Jun. 09, 2006 |
Swap Agreement Three |  |
Swaps: |  |
Original variable, rate debt amount | 300.0 |
Agreement date | Aug. 16, 2006 |
Effective date | Aug. 18, 2006 |
Expiration date | Aug. 10, 2018 |
Designed cash flow hedge date | Aug. 04, 2006 |
Swap Agreement Four |  |
Swaps: |  |
Original variable, rate debt amount | 30.0 |
Agreement date | Feb. 09, 2007 |
Effective date | Feb. 12, 2007 |
Expiration date | Feb. 10, 2014 |
Designed cash flow hedge date | Feb. 09, 2007 |
Swap Agreement Five |  |
Swaps: |  |
Original variable, rate debt amount | 20.0 |
Agreement date | Mar. 08, 2007 |
Effective date | Mar. 12, 2007 |
Expiration date | Mar. 10, 2014 |
Designed cash flow hedge date | Mar. 08, 2007 |
Swap Agreement Six |  |
Swaps: |  |
Original variable, rate debt amount | 20.0 |
Agreement date | Mar. 08, 2007 |
Effective date | Mar. 12, 2007 |
Expiration date | Mar. 10, 2014 |
Designed cash flow hedge date | Mar. 08, 2007 |
Swap Agreement Seven |  |
Swaps: |  |
Original variable, rate debt amount | 19.3 | [1]
Agreement date | Apr. 08, 2008 |
Effective date | Aug. 15, 2008 |
Expiration date | Jun. 15, 2015 |
Designed cash flow hedge date | Mar. 31, 2008 |
Swap Agreement Eight |  |
Swaps: |  |
Original variable, rate debt amount | 19.0 |
Agreement date | Aug. 27, 2008 |
Effective date | Aug. 29, 2008 |
Expiration date | Jul. 10, 2015 |
Designed cash flow hedge date | Apr. 10, 2008 |
Swap Agreement Nine |  |
Swaps: |  |
Original variable, rate debt amount | 30.0 |
Agreement date | Sep. 24, 2008 |
Effective date | Sep. 30, 2008 |
Expiration date | Sep. 10, 2015 |
Designed cash flow hedge date | Sep. 24, 2008 |
Swap Agreement Ten |  |
Swaps: |  |
Original variable, rate debt amount | 15.0 | [1]
Agreement date | Mar. 24, 2009 |
Effective date | Mar. 30, 2009 |
Expiration date | Mar. 30, 2016 |
Designed cash flow hedge date | Mar. 25, 2009 |
Swap Agreement Eleven |  |
Swaps: |  |
Original variable, rate debt amount | 14.7 | [1]
Agreement date | Jul. 06, 2010 |
Effective date | Aug. 15, 2010 |
Expiration date | Jul. 15, 2017 |
Designed cash flow hedge date | Jul. 06, 2010 |
Swap Agreement Twelve |  |
Swaps: |  |
Original variable, rate debt amount | 25.0 | [1]
Agreement date | Apr. 26, 2011 |
Effective date | Jun. 01, 2011 |
Expiration date | Jun. 01, 2018 |
Designed cash flow hedge date | Jul. 01, 2011 |
Swap Agreement Thirteen |  |
Swaps: |  |
Original variable, rate debt amount | 50.0 | [1]
Agreement date | Jul. 29, 2011 |
Effective date | Aug. 15, 2011 |
Expiration date | Aug. 15, 2018 |
Designed cash flow hedge date | Jul. 29, 2011 |
Swap Agreement Fourteen |  |
Swaps: |  |
Original variable, rate debt amount | 20.0 | [1]
Agreement date | Aug. 03, 2011 |
Effective date | Sep. 12, 2011 |
Expiration date | Sep. 10, 2018 |
Designed cash flow hedge date | Aug. 03, 2011 |
Swap Agreement Fifteen |  |
Swaps: |  |
Original variable, rate debt amount | 15.1 | [2]
Agreement date | Mar. 27, 2012 |
Effective date | Mar. 28, 2012 |
Expiration date | Mar. 28, 2019 |
Designed cash flow hedge date | Mar. 26, 2012 |
Swap Agreement Sixteen |  |
Swaps: |  |
Original variable, rate debt amount | 25.0 |
Agreement date | Apr. 13, 2012 |
Effective date | Apr. 16, 2012 |
Expiration date | Apr. 01, 2019 |
Designed cash flow hedge date | Apr. 12, 2012 |
Swap Agreement Seventeen |  |
Swaps: |  |
Original variable, rate debt amount | $ 44.3 |
Agreement date | Jan. 11, 2013 |
Effective date | Jan. 15, 2013 |
Expiration date | Dec. 15, 2019 |
Designed cash flow hedge date | Jan. 11, 2013 |
[1] | forward swap
[2] | operating lease

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