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Derivatives (Interest rate swap agreements) (Details) - Jun. 30, 2015 - USD ($) $ in Millions | Total
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Swap Agreement Three [Member] |  |
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 Eight [Member] |  |
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 [Member] |  |
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 [Member] |  |
Swaps: |  |
Original variable, rate debt amount | [1] | $ 15.0
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 [Member] |  |
Swaps: |  |
Original variable, rate debt amount | [1] | $ 14.7
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 [Member] |  |
Swaps: |  |
Original variable, rate debt amount | [1] | $ 25.0
Agreement date |  | Apr. 26, 2011
Effective date |  | Jun. 01, 2011
Expiration date |  | Jun. 01, 2018
Designed cash flow hedge date |  | Jun. 01, 2011
Swap Agreement Thirteen [Member] |  |
Swaps: |  |
Original variable, rate debt amount | [1] | $ 50.0
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 [Member] |  |
Swaps: |  |
Original variable, rate debt amount | [1] | $ 20.0
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 [Member] |  |
Swaps: |  |
Original variable, rate debt amount | [2] | $ 15.1
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 [Member] |  |
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 [Member] |  |
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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- Definition Date the derivative is designated as a cash flow hedge. + References No definition available. + Details
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- Definition Face (par) amount of debt instrument at time of issuance. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=34725769&loc=d3e28878-108400 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28551-108399 + Details
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