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Share-based Compensation and Other Employment Benefit Plans (Restricted Stock Units Activity) (Details) - $ / shares | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Restricted Share Units |  |  |
Quantity |  |  |
Outstanding, Beginning of Period (in shares) | 817,000 | 526,000 | 566,000
Granted (in shares) | 763,000 | 550,000 | 249,000
Assumed in acquisition (in shares) |  | 136,000 |
Dividend equivalents granted (in shares) | 59,000 | 23,000 | 7,000
Quantity change by TSR factor (in shares) | 0 | 0 | 0
Vested (in shares) | (384,000) | (304,000) | (280,000)
Adjustment for performance vs. target (in shares) | 0 | 0 | 0
Forfeited (in shares) | (34,000) | (114,000) | (16,000)
Outstanding, End of Period (in shares) | 1,221,000 | 817,000 | 526,000
Weighted-Average Grant Date Fair Value |  |  |
Outstanding, Beginning of Period, Weighted-Average Grant-date Fair Value (in dollars per share) | $ 38.32 | $ 41.18 | $ 33.25
Granted, Weighted-Average Grant-date Fair Value (in dollars per share) | 32.42 | 36.27 | 47.34
Assumed in acquisition (in dollars per share) |  | 31.99 |
Dividend equivalents granted, Weighted-Average Grant-date Fair Value (in dollars per share) | 32.42 | 36.27 | 44.10
Quantity change by TSR factor (in dollars per share) | 0 | 0 | 0
Vested, Weighted-Average Grant-date Fair Value (in dollars per share) | 38.04 | 37.04 | 30.86
Adjustment for performance vs. target (in dollars per share) | 0 | 0 | 0
Forfeited, Weighted-Average Grant-date Fair Value (in dollars per share) | 35.97 | 37.04 | 38.60
Outstanding, End of Period, Weighted-Average Grant-date Fair Value (in dollars per share) | $ 34.50 | $ 38.32 | $ 41.18
Market Restricted Share Units |  |  |
Quantity |  |  |
Outstanding, Beginning of Period (in shares) | 216,000 | 144,000 | 171,000
Granted (in shares) | 0 | 163,000 | 58,000
Assumed in acquisition (in shares) |  | 0 |
Dividend equivalents granted (in shares) | 9,000 | 6,000 | 3,000
Quantity change by TSR factor (in shares) | 7,000 | (19,000) | 18,000
Vested (in shares) | (104,000) | (59,000) | (105,000)
Adjustment for performance vs. target (in shares) | 0 | 0 | 0
Forfeited (in shares) | (37,000) | (19,000) | (1,000)
Outstanding, End of Period (in shares) | 91,000 | 216,000 | 144,000
Weighted-Average Grant Date Fair Value |  |  |
Outstanding, Beginning of Period, Weighted-Average Grant-date Fair Value (in dollars per share) | $ 39.99 | $ 41.91 | $ 35.24
Granted, Weighted-Average Grant-date Fair Value (in dollars per share) | 0 | 37.20 | 48.46
Assumed in acquisition (in dollars per share) |  | 0 |
Dividend equivalents granted, Weighted-Average Grant-date Fair Value (in dollars per share) | 39.99 | 37.20 | 41.91
Quantity change by TSR factor (in dollars per share) | 41.00 | 37.99 | 33.21
Vested, Weighted-Average Grant-date Fair Value (in dollars per share) | 41.00 | 37.99 | 33.21
Adjustment for performance vs. target (in dollars per share) | 0 | 0 | 0
Forfeited, Weighted-Average Grant-date Fair Value (in dollars per share) | 38.42 | 37.99 | 38.32
Outstanding, End of Period, Weighted-Average Grant-date Fair Value (in dollars per share) | $ 39.54 | $ 39.99 | $ 41.91
Performance Share Units |  |  |
Quantity |  |  |
Outstanding, Beginning of Period (in shares) | 279,000 | 248,000 | 245,000
Granted (in shares) | 131,000 | 140,000 | 86,000
Assumed in acquisition (in shares) |  | 0 |
Dividend equivalents granted (in shares) | 23,000 | 9,000 | 4,000
Quantity change by TSR factor (in shares) | 0 | 0 | 0
Vested (in shares) | (110,000) | (93,000) | (84,000)
Adjustment for performance vs. target (in shares) | 34,000 | 6,000 | (1,000)
Forfeited (in shares) | (9,000) | (31,000) | (2,000)
Outstanding, End of Period (in shares) | 348,000 | 279,000 | 248,000
Weighted-Average Grant Date Fair Value |  |  |
Outstanding, Beginning of Period, Weighted-Average Grant-date Fair Value (in dollars per share) | $ 41.52 | $ 38.29 | $ 31.54
Granted, Weighted-Average Grant-date Fair Value (in dollars per share) | 35.75 | 37.34 | 47.23
Assumed in acquisition (in dollars per share) |  | 0 |
Dividend equivalents granted, Weighted-Average Grant-date Fair Value (in dollars per share) | 41.52 | 37.34 | 28.06
Quantity change by TSR factor (in dollars per share) | 0 | 0 | 0
Vested, Weighted-Average Grant-date Fair Value (in dollars per share) | 41.61 | 26.35 | 28.06
Adjustment for performance vs. target (in dollars per share) | 41.61 | 37.34 | 28.06
Forfeited, Weighted-Average Grant-date Fair Value (in dollars per share) | 41.52 | 40.34 | 33.52
Outstanding, End of Period, Weighted-Average Grant-date Fair Value (in dollars per share) | $ 39.33 | $ 41.52 | $ 38.29

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- Definition The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iv)(3) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Weighted average fair value as of the grant date of equity-based award plans other than stock (unit) option plans that were not exercised or put into effect as a result of the occurrence of a terminating event. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(3) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Per share or unit weighted-average fair value of nonvested award under share-based payment arrangement. Excludes share and unit options. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(2) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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