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Commitments and Contingencies (Details) (USD $) In Millions, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2013 item | Dec. 31, 2012 item | Dec. 31, 2011
Commitments and Contingencies |  |  |
Irrevocable standby letters of credit outstanding | $ 18.4 | $ 19.7 |
Number of letters of credit related to the payment obligation under insurance programs | 1 | 1 |
Letters of credit outstanding related to the payment obligation under insurance programs | 17.5 | 17.5 |
Letters of credit outstanding related to contract performance obligations | 0.9 | 2.2 |
Leases |  |  |
Number of leases that included guaranteed residual values | 0 |  |
Future minimum lease payments for operating leases |  |  |
2014 | 1.9 |  |
2015 | 0.9 |  |
2016 | 0.4 |  |
2017 | 0.2 |  |
2018 | 0.2 |  |
Thereafter | 0.2 |  |
Operating lease, additional disclosure |  |  |
Rent expense | 51.2 | 43.1 | 32.2
Purchase Commitments for Construction Equipment |  |  |
Outstanding purchase orders for certain construction equipment | $ 6.1 |  |
Scheduled period of time for cash outlay | 5 months |  |
Minimum |  |  |
Leases |  |  |
Term of operating lease | 1 year |  |
Maximum |  |  |
Leases |  |  |
Term of operating lease | 7 years |  |

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