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Other Liabilities (Insurance Reserves) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Self Insurance Reserve      
Balance at beginning of year $ 420.2 $ 418.5 $ 405.8
Additions charged to expense 452.4 432.9 410.3
Payments (461.4) (448.0) (400.5)
Accretion expense 0.9 1.2 1.5
Premium written for third party risk assumed 31.6 29.6 23.4
Reclassified to ceded insurance reserves (20.0) (14.0) (22.0)
Balance at end of year 423.7 420.2 418.5
Less: current portion (152.9) (144.8) (143.9)
Long-term portion $ 270.8 $ 275.4 $ 274.6