XML 44 R31.htm IDEA: XBRL DOCUMENT
v3.10.0.1

Inventories (Tables) | 12 Months Ended
--- | ---
Dec. 31, 2018
Inventories |
Schedule of inventories |
| December 31, |  | December 31,
| 2018 |  | 2017
| (in millions)
LIFO inventories - cost on FIFO method | $ | 1,737.3 |  | $ | 1,390.0
Cost on FIFO method higher than LIFO value |  | (293.6) |  |  | (21.8)
Inventories - stated on LIFO method |  | 1,443.7 |  |  | 1,368.2
Inventories - stated on FIFO method |  | 373.4 |  |  | 357.8
| $ | 1,817.1 |  | $ | 1,726.0
Schedule of changes in the LIFO valuation reserve and impact of LIFO liquidations |
| Year Ended December 31,
| 2018 |  | 2017 |  | 2016
| (in millions)
LIFO inventory valuation reserve adjustment charge (income) | $ | 271.8 |  | $ | 73.3 |  | $ | (8.5)
Liquidation of LIFO inventory quantities that increased cost of sales |  | ** |  |  | ** |  |  | **
** Insignificant liquidations of LIFO inventory quantities.

X
- Definition The tabular disclosure of the LIFO valuation reserve and impact of LIFO liquidations. + References No definition available. + Details
Name: | rs_ScheduleOfInventoryValuationReserveAndInventoryLiquidationsTableTextBlock
Namespace Prefix: | rs_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- References No definition available. + Details
Name: | us-gaap_InventoryNetAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of the carrying amount as of the balance sheet date of merchandise, goods, commodities, or supplies held for future sale or to be used in manufacturing, servicing or production process. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(6)(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(6)(a)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6361739&loc=d3e7789-107766 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(6)(c)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
Name: | us-gaap_ScheduleOfInventoryCurrentTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration